We use cookies to show content based on your preferences. If you continue to browse you accept their use and installation. More information. >

FMF - Friends of Minerals Forum, discussion and message board
The place to share your mineralogical experiences

FMF English Forum is moderated by John S. White and Peter Megaw
 

Spanish message board






Newest topics and users posts
16 Oct-12:17:55 Re: collection of enrique llorens (Carles Millan)
16 Oct-11:23:16 Re: collection of enrique llorens (Enrique Llorens)
16 Oct-11:19:55 Re: collection of enrique llorens (Enrique Llorens)
16 Oct-11:13:01 Re: a mineralogical trip through the states of usa - ohio (Bob Harman)
16 Oct-10:55:09 Re: a mineralogical trip through the states of usa - ohio (R Saunders)
16 Oct-10:27:30 Re: a mineralogical trip through the states of usa - ohio (Bob Harman)
16 Oct-09:45:21 Re: collection of enrique llorens (Michael Shaw)
16 Oct-09:32:14 Re: a mineralogical trip through the states of usa - ohio (Michael Shaw)
16 Oct-08:08:27 Re: collection of enrique llorens (Tobi)
16 Oct-08:05:06 Re: a mineralogical trip through germany (Tobi)
16 Oct-07:54:00 Re: collection of enrique llorens (Jose Luis Jara Jara)
16 Oct-05:32:28 Re: a mineralogical trip through the states of usa - ohio (Bob Harman)
16 Oct-05:06:27 Re: a mineralogical trip through the states of usa - ohio (Bob Harman)
16 Oct-02:03:59 Re: collection of enrique llorens (Enrique Llorens)
15 Oct-13:40:10 Re: the mizunaka collection (Am Mizunaka)
15 Oct-04:03:23 Re: the mizunaka collection (Tobi)
15 Oct-03:52:38 Re: a mineralogical trip through germany / sachsen - saxony (Tobi)
14 Oct-23:00:11 The mizunaka collection - quartz (Am Mizunaka)
14 Oct-16:07:06 Re: a mineralogical trip through germany / sachsen - saxony (Bob Harman)
14 Oct-14:12:27 Re: a mineralogical trip through germany / sachsen - saxony (Jesse Fisher)
14 Oct-11:56:42 Re: a mineralogical trip through germany / bayern - bavaria (Tobi)
14 Oct-08:45:23 Re: a mineralogical trip through germany / bayern - bavaria (Jesse Fisher)
14 Oct-08:22:49 Re: collection of michael shaw (Michael Shaw)
14 Oct-03:13:18 Re: a mineralogical trip through germany / bayern - bavaria (Tobi)
13 Oct-20:43:17 Re: don lum collection (Don Lum)

For lists of newest topics and postings click here


RSS RSS

View unanswered posts

Why and how to register

Index Index
 FAQFAQ RegisterRegister  Log inLog in
 {Forgotten your password?}Forgotten your password?  

Like
58860


The time now is Oct 16, 2019 12:47

Search for a textSearch for a text   

A general guide for using the Forum with some rules and tips
Don Lum Collection
  Goto page Previous  1, 2, 3 ... 15, 16, 17 ... 70, 71, 72  Next
  Index -> Collection photos and Collector's page
Like
3114


View previous topic :: View next topic  
Author Message

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 10, 2013 23:41    Post subject: Re: Don Lum Collection  

Collection specimens


1-IMG_1514.JPG
 Description:
Rhodochrosite, Manganite
Hotazel Mine, Kalahari Manganese Fields, South Africa
10.5 x 6 cm
 Viewed:  22787 Time(s)

1-IMG_1514.JPG



1-IMG_1520.JPG
 Description:
Rhodochrosite, Manganite
Hotazel Mine, Kalahari Manganese Fields, South Africa
10.5 x 6 cm
 Viewed:  22748 Time(s)

1-IMG_1520.JPG



1-IMG_1518.JPG
 Description:
Rhodochrosite, Manganite
Hotazel Mine, Kalahari Manganese Fields, South Africa
10.5 x 6 cm
 Viewed:  22800 Time(s)

1-IMG_1518.JPG



1-IMG_1543.JPG
 Description:
Hematite after Magnetite (Martite)
Payun Matru Volcano, Malargue, Mendoza, Argentina
9.5 x 3.9 x 3.7 cm
 Viewed:  22764 Time(s)

1-IMG_1543.JPG



_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   

Pierre Joubert




Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 11, 2013 02:23    Post subject: Re: Don Lum Collection  

Congratulations on acquiring the rhodo from Hotazel. Even for us living in SA, that is becoming VERY difficult. I also found the hematite https://www.mineral-forum.com/message-board/files/1_img_1543_342.jpg specimen exceptional. Regards, Pierre
_________________
Pierre Joubert


'The tree of silence bears the fruit of peace. '
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 11, 2013 11:33    Post subject: Re: Don Lum Collection  

Pierre Joubert wrote:
Congratulations on acquiring the rhodo from Hotazel. Even for us living in SA, that is becoming VERY difficult. I also found the hematite https://www.mineral-forum.com/message-board/files/1_img_1543_342.jpg specimen exceptional. Regards, Pierre


Thank you, Pierre. I am fortunate to have both of these pieces. Hello to Riana.

Sincerely,

Don

_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   

Pierre Joubert




Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 11, 2013 12:08    Post subject: Re: Don Lum Collection  

Don Lum wrote:
Pierre Joubert wrote:
Congratulations on acquiring the rhodo from Hotazel. Even for us living in SA, that is becoming VERY difficult. I also found the hematite https://www.mineral-forum.com/message-board/files/1_img_1543_342.jpg specimen exceptional. Regards, Pierre


Thank you, Pierre. I am fortunate to have both of these pieces. Hello to Riana.

Sincerely,

Don



Thank you Don:-)

_________________
Pierre Joubert


'The tree of silence bears the fruit of peace. '
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 11, 2013 22:33    Post subject: Re: Don Lum Collection  

Collection specimens


1-IMG_1567.JPG
 Description:
Hematite, Quartz
Rio Marina, Isola d'Elba, Italy
3.3 x 2.7 x 2 cm
 Viewed:  22648 Time(s)

1-IMG_1567.JPG



1-IMG_1573.JPG
 Description:
Hematite, Quartz
Rio Marina, Isola d'Elba, Italy
3.3 x 2.7 x 2 cm
 Viewed:  22658 Time(s)

1-IMG_1573.JPG



1-IMG_1575.JPG
 Description:
Baryte with inclusions
18 Mine, Paleokamariza Mines, Lavrion, Attiki, Greece
6.4 x 4.8 x 2.4 cm
 Viewed:  22679 Time(s)

1-IMG_1575.JPG



1-IMG_1580.JPG
 Description:
Hematite
Florence Mine, Egremont, England
9 x 7.5 cm
 Viewed:  22614 Time(s)

1-IMG_1580.JPG



1-IMG_1581.JPG
 Description:
Hematite
Florence Mine, Egremont, England
9 x 7.5 cm
 Viewed:  22669 Time(s)

1-IMG_1581.JPG



_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 12, 2013 14:49    Post subject: Re: Don Lum Collection  

Arkansas Quartz

The first specimen is a Coontail Quartz.

The following is an excerpt from Rockhounding Arkansas by Mike Howard: Coontail Quartz is a local name for a particular variety of smoky quartz collected at several sites adjacent to Magnet Cove. There are alternating zones of black and milky quartz.

The Runyon Mine is located one mile north of Magnet Cove.

The second specimen is a 100% natural quartz from Saline County, Arkansas. Mike told me recently that the gray color is due to fine-grained shale inclusions.



1-IMG_1610.JPG
 Description:
Quartz (var Smoky), Novaculite
Runyon Mine, Hot Spring County, Arkansas, USA
14.2 x 11.4 x 11 cm
Coontail Quartz
 Viewed:  22460 Time(s)

1-IMG_1610.JPG



1-IMG_1611.JPG
 Description:
Quartz (var Smoky), Novaculite
Runyon Mine, Hot Spring County, Arkansas, USA
14.2 x 11.4 x 11 cm
Coontail Quartz
 Viewed:  22409 Time(s)

1-IMG_1611.JPG



1-IMG_1612.JPG
 Description:
Quartz (var Smoky), Novaculite
Runyon Mine, Hot Spring County, Arkansas, USA
14.2 x 11.4 x 11 cm
Coontail Quartz
 Viewed:  22523 Time(s)

1-IMG_1612.JPG



1-IMG_1614.JPG
 Description:
Quartz
Saline County, Arkansas, USA
12.2 x 10 cm
 Viewed:  22427 Time(s)

1-IMG_1614.JPG



1-IMG_1616.JPG
 Description:
Quartz
Saline County, Arkansas, USA
12.2 x 10 cm
 Viewed:  22422 Time(s)

1-IMG_1616.JPG



1-IMG_1617.JPG
 Description:
Quartz
Saline County, Arkansas, USA
12.2 x 10 cm
 Viewed:  22483 Time(s)

1-IMG_1617.JPG



_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
1
   

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 12, 2013 18:04    Post subject: Re: Don Lum Collection  

Irradiated Arkansas Quartz.

At some point in the past someone decided that medium grade milky quartz was much more attractive and salable if it was irradiated.

Mike Howard told me that the process was fairly simple. The selected specimens were packed in buckets or barrels and then they were shipped to Missouri to a company that had a strong gamma source. The container was then exposed to gamma rays for a given period of time.

The quartz must contain a trace of aluminum for the process to work. Crystals from the Coleman mine was the most often used. An attempt to change by irradiation some Jeffrey quartz failed to turn it smokey, as it has no aluminum within the lattice structure.

The artificial process is a reasonable simulation of how smokey quartz forms in nature, through the presence of radioactive gamma emitters present, either as discrete minerals or within the fluids that the crystals are forming from.



1-IMG_1619.JPG
 Description:
Quartz (irradiated)
Arkansas, USA
12.4 x 7.2 cm
Irradiated
 Viewed:  22404 Time(s)

1-IMG_1619.JPG



1-IMG_1621.JPG
 Description:
Quartz (irradiated)
Arkansas, USA
12.4 x 7.2 cm
Irradiated
 Viewed:  22427 Time(s)

1-IMG_1621.JPG



_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
1
   

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 14, 2013 17:02    Post subject: Re: Don Lum Collection  

Collection


1-IMG_1585.JPG
 Description:
Fluorite, Quartz
Santa Gertrudis vein, Santa Librada, Mun. de Mapimí, Durango, Mexico
7.5 x 6.5 cm
 Viewed:  22090 Time(s)

1-IMG_1585.JPG



1-IMG_1588.JPG
 Description:
Skutterudite
Bou Azzer District, Anti-Atlas Mountains, Tazenakht, Ouarzazate Province, Souss-Massa-Draa Region, Morocco
6.5 x 6.4 cm
 Viewed:  22040 Time(s)

1-IMG_1588.JPG



1-IMG_1594.JPG
 Description:
Skutterudite
Bou Azzer District, Anti-Atlas Mountains, Tazenakht, Ouarzazate Province, Souss-Massa-Draa Region, Morocco
6.5 x 6.4 cm
 Viewed:  22041 Time(s)

1-IMG_1594.JPG



1-IMG_1598.JPG
 Description:
Fluorite, Quartz
Yaogangxian Mine, Hunan, China
10 x 9 cm
 Viewed:  22031 Time(s)

1-IMG_1598.JPG



1-IMG_1602.JPG
 Description:
Fluorite, Quartz
Yaogangxian Mine, Hunan, China
10 x 9 cm
 Viewed:  22068 Time(s)

1-IMG_1602.JPG



1-IMG_1604.JPG
 Description:
Fluorite, Quartz
Yaogangxian Mine, Hunan, China
10 x 9 cm
 Viewed:  22040 Time(s)

1-IMG_1604.JPG



1-IMG_1609.JPG
 Description:
Fluorite, Quartz
Yaogangxian Mine, Hunan, China
10 x 9 cm
 Viewed:  22034 Time(s)

1-IMG_1609.JPG



_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 16, 2013 13:41    Post subject: Re: Don Lum Collection  

Light sensitive minerals


1-IMG_1624.JPG
 Description:
Proustite, Acanthite pseudomorph after Silver Wire
Uchucchuacua Mine, Oyon Province, Lima Department, Peru
6.2 x 4.3 cm
 Viewed:  21937 Time(s)

1-IMG_1624.JPG



1-IMG_1627-001.JPG
 Description:
Proustite, Acanthite pseudomorph after Silver Wire
Uchucchuacua Mine, Oyon Province, Lima Department, Peru
6.2 x 4.3 cm
 Viewed:  21952 Time(s)

1-IMG_1627-001.JPG



1-IMG_1629.JPG
 Description:
Proustite, Acanthite
Imiter Mine, Anti-Atlas Mountains, Souss-Massa-Draa, Morocco
4 x 3.3 x 2.2 cm
 Viewed:  21931 Time(s)

1-IMG_1629.JPG



1-IMG_1637.JPG
 Description:
Proustite, Galena
Harz Mountains, Lower Saxony, Germany
4.1 x 3.5 cm
ex Harvard Collection
ex Elling Collection
 Viewed:  21974 Time(s)

1-IMG_1637.JPG



1-IMG_1639.JPG
 Description:
Proustite, Galena
Harz Mountains, Lower Saxony, Germany
4.1 x 3.5 cm
ex Harvard Collection
ex Elling Collection
 Viewed:  21961 Time(s)

1-IMG_1639.JPG



_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 17, 2013 16:52    Post subject: Re: Don Lum Collection  

Light sensitive minerals


1-IMG_1641.JPG
 Description:
Cinnabar, Dolomite
Tongren Mine, Washan District, Tongren Prefecture, Guizhou Province. China
5 x 3.7 cm
 Viewed:  21863 Time(s)

1-IMG_1641.JPG



1-IMG_1646.JPG
 Description:
Cinnabar, Dolomite
Tongren Mine, Washan District, Tongren Prefecture, Guizhou Province. China
5 x 3.7 cm
 Viewed:  21894 Time(s)

1-IMG_1646.JPG



1-IMG_1647.JPG
 Description:
Pyrargyrite
San Genaro Mine, Castrovirreyna Province, Huancavelica Department, Peru
2.7 x 2.5 cm
 Viewed:  21851 Time(s)

1-IMG_1647.JPG



1-IMG_1649.JPG
 Description:
Pyrargyrite
San Genaro Mine, Castrovirreyna Province, Huancavelica Department, Peru
2.7 x 2.5 cm
 Viewed:  21891 Time(s)

1-IMG_1649.JPG



1-IMG_1654.JPG
 Description:
Pyrargyrite, Calcite
Level 630 of the San Guillermo Vein, San Luis Shaft, Fresnillo, Zacatecas, Mexico
4.7 x 4.2 cm
 Viewed:  21887 Time(s)

1-IMG_1654.JPG



1-IMG_1658.JPG
 Description:
Spodumene variety Kunzite
Pech, Kunar Province, Afghanistan
6.6 x 6.5 cm
 Viewed:  21880 Time(s)

1-IMG_1658.JPG



_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 18, 2013 14:25    Post subject: Re: Don Lum Collection  

Light sensitive minerals


1-IMG_1663.JPG
 Description:
Spodumene variey kunzite
Pech, Kunar Province, Afghanistan
6 x 4.3 cm
Kunzite floater with double termination
 Viewed:  21791 Time(s)

1-IMG_1663.JPG



1-IMG_1672.JPG
 Description:
Spodumene variey kunzite
Pech, Kunar Province, Afghanistan
6 x 4.3 cm
Kunzite floater with double termination
 Viewed:  21812 Time(s)

1-IMG_1672.JPG



1-IMG_1682.JPG
 Description:
Spodumene
Namacotche, Mutala, Mozambique
8 x 2.9 cm
 Viewed:  21839 Time(s)

1-IMG_1682.JPG



_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
1
   

Mike Wood




Joined: 16 Dec 2010
Posts: 456
Location: Northern England


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 18, 2013 19:02    Post subject: Re: Don Lum Collection  

Nice kunzites Don, I especially like the one from Pech, Afghanistan in your last post. How did you get the colour change I wonder - was it a different light source, different direction of the crystal, or was it the different coloured background ?

Regards, Mike
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 18, 2013 19:19    Post subject: Re: Don Lum Collection  

Mike Wood wrote:
Nice kunzites Don, I especially like the one from Pech, Afghanistan in your last post. How did you get the colour change I wonder - was it a different light source, different direction of the crystal, or was it the different coloured background ?

Regards, Mike


Thank you, Mike.

I don't write down my settings but if my memory serves me correctly, image 1663 is with filtered quartz and Reveal(General Electric Trademark) bulbs from above to highlight the termination "peaks." Image 1672 is actually closer to the true color and is with an LED light source from behind the crystal down the c-axis. I use four and sometimes five light sources and turn one or more on at a time.

I am as far from being a professional photographer as one can be.

Also if some of my photos are out of focus, it is my fault and not the camera's as my visual acuity is not what it was six or seven decades ago.

Sincerely,

Don

_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   

Pierre Joubert




Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 19, 2013 01:37    Post subject: Re: Don Lum Collection  

Don Lum wrote:
Mike Wood wrote:
Nice kunzites Don, I especially like the one from Pech, Afghanistan in your last post. How did you get the colour change I wonder - was it a different light source, different direction of the crystal, or was it the different coloured background ?

Regards, Mike


Thank you, Mike.

I don't write down my settings but if my memory serves me correctly, image 1663 is with filtered quartz and Reveal(General Electric Trademark) bulbs from above to highlight the termination "peaks." Image 1672 is actually closer to the true color and is with an LED light source from behind the crystal down the c-axis. I use four and sometimes five light sources and turn one or more on at a time.

I am as far from being a professional photographer as one can be.

Also if some of my photos are out of focus, it is my fault and not the camera's as my visual acuity is not what it was six or seven decades ago.

Sincerely,

Don


I can see your passion for specimens Don. You take a lot of time and care to make stands for all of them. Thank you for sharing your WONDERFUL hobby with us:-)

_________________
Pierre Joubert


'The tree of silence bears the fruit of peace. '
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 19, 2013 10:40    Post subject: Re: Don Lum Collection  

Pierre Joubert wrote:
Don Lum wrote:
Mike Wood wrote:
Nice kunzites Don, I especially like the one from Pech, Afghanistan in your last post. How did you get the colour change I wonder - was it a different light source, different direction of the crystal, or was it the different coloured background ?

Regards, Mike

Thank you, Mike.

I don't write down my settings but if my memory serves me correctly, image 1663 is with filtered quartz and Reveal(General Electric Trademark) bulbs from above to highlight the termination "peaks." Image 1672 is actually closer to the true color and is with an LED light source from behind the crystal down the c-axis. I use four and sometimes five light sources and turn one or more on at a time.

I am as far from being a professional photographer as one can be.

Also if some of my photos are out of focus, it is my fault and not the camera's as my visual acuity is not what it was six or seven decades ago.

Sincerely,

Don

I can see your passion for specimens Don. You take a lot of time and care to make stands for all of them. Thank you for sharing your WONDERFUL hobby with us:-)

Thank you for your kind comment, Pierre. I do enjoy my minerals. Hi to Riana.

Regards,

Don

_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   

Mike Wood




Joined: 16 Dec 2010
Posts: 456
Location: Northern England


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 19, 2013 16:12    Post subject: Re: Don Lum Collection  

Thank you for your reply Don. I wonder if the 'filtered quartz and reveal' bulb is an arc-light type bulb with quartz glass which would allow UV light to illuminate the subject, thus producing the strong pink colour of the kunzite in image 1663. Could it then be fluorescence causing the colour change?

Best regards, Mike
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 19, 2013 17:14    Post subject: Re: Don Lum Collection  

Mike Wood wrote:
Thank you for your reply Don. I wonder if the 'filtered quartz and reveal' bulb is an arc-light type bulb with quartz glass which would allow UV light to illuminate the subject, thus producing the strong pink colour of the kunzite in image 1663. Could it then be fluorescence causing the colour change?

Best regards, Mike


Dear Mike,

What I used was a quartz halogen lamp that has a clear plate over the bulb (factory installed) and a Reveal GE (TM) bulb which has a "full spectrum" although I don't know the exact wavelength of the light emitted. I used a sheet of white copy paper between the light(s) and the specimen and that seemed to bring out the surface details which were washed out without the paper. I also used that technique in the last Russian Fluorite specimen that I posted a while back on FMF. I hope this helps.

Sincerely,

Don

_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   

Mike Wood




Joined: 16 Dec 2010
Posts: 456
Location: Northern England


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 19, 2013 17:47    Post subject: Re: Don Lum Collection  

Ahhh, now I see the light ! Thanks for explaining that Don. The paper between the light and the subject technique sounds neat, I'll have to give that a go.

Sincerely yours,

Mike : )
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 19, 2013 18:09    Post subject: Re: Don Lum Collection  

Today I am posting the last two of the light sensitive minerals that I have photographed; then back to storage to preserve what color is left for the next owner(s).

The first specimen is an Ametrine slab polished on both sides from the Anahi Mine in Bolivia. This specimen demonstrates the alternating zones of purple and yellow within these natural bi-color crystals. The purple (Amethyst) shows strong Brazil-law twinning. The yellow (Citrine) areas do not show twinning. Two separate individual colored crystals grew together to form an alternating "radiation" pattern of yellow and purple triangles when viewed down the c-axis. This material is found in only one place in the world



1-IMG_1677.JPG
 Description:
Ametrine (Slab polished on both sides)
Anahi Mine, La Gaiba District, Sandoval Province, Santa Cruz Department, Bolivia
7.2 x 6.2 x 1.8 cm
 Viewed:  21555 Time(s)

1-IMG_1677.JPG



1-IMG_1678.JPG
 Description:
Ametrine (Slab polished on both sides)
Anahi Mine, La Gaiba District, Sandoval Province, Santa Cruz Department, Bolivia
7.2 x 6.2 x 1.8 cm
 Viewed:  21589 Time(s)

1-IMG_1678.JPG



1-IMG_1685.JPG
 Description:
Realgar, Orpiment
Quiruvilla, Santiago de Chuco, La Libertad, Peru
6.6 x 5 cm
 Viewed:  21566 Time(s)

1-IMG_1685.JPG



1-IMG_1688.JPG
 Description:
Realgar, Orpiment
Quiruvilla, Santiago de Chuco, La Libertad, Peru
6.6 x 5 cm
 Viewed:  21550 Time(s)

1-IMG_1688.JPG



_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   

Don Lum




Joined: 03 Sep 2012
Posts: 2121
Location: Arkansas


Access to the FMF Gallery title=

View user's profile

Send private message

PostPosted: Nov 19, 2013 19:05    Post subject: Re: Don Lum Collection  

Don Lum wrote:
Mike Wood wrote:
Thank you for your reply Don. I wonder if the 'filtered quartz and reveal' bulb is an arc-light type bulb with quartz glass which would allow UV light to illuminate the subject, thus producing the strong pink colour of the kunzite in image 1663. Could it then be fluorescence causing the colour change?

Best regards, Mike


Dear Mike,

What I used was a quartz halogen lamp that has a clear plate over the bulb (factory installed) and a Reveal GE (TM) bulb which has a "full spectrum" although I don't know the exact wavelength of the light emitted. I used a sheet of white copy paper between the light(s) and the specimen and that seemed to bring out the surface details which were washed out without the paper. I also used that technique in the last Russian Fluorite specimen that I posted a while back on FMF. I hope this helps.

Sincerely,

Don


Mike, the image I am referring to is: https://www.mineral-forum.com/message-board/files/1_img_1386_168.jpg
1-IMG_1386.JPG posted on October 18, 2013, page 15 of my collection. Fluorite from the 2nd Soviet Mine.

Don

_________________
hogwild
Back to top
Reply to topic Reply with quote
Like
   
Display posts from previous:   
   Index -> Collection photos and Collector's page   All times are GMT - 5 Hours
Page 16 of 72
  Goto page Previous  1, 2, 3 ... 15, 16, 17 ... 70, 71, 72  Next  

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


All pictures, text, design © Forum FMF 2006-2019


Powered by FMF