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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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 Posted: Nov 10, 2013 23:41 Post subject: Re: Don Lum Collection |
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Collection specimens
| Description: |
Rhodochrosite, Manganite
Hotazel Mine, Kalahari Manganese Fields, South Africa
10.5 x 6 cm |
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31848 Time(s) |
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| Description: |
Rhodochrosite, Manganite
Hotazel Mine, Kalahari Manganese Fields, South Africa
10.5 x 6 cm |
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| Viewed: |
31812 Time(s) |
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| Description: |
Rhodochrosite, Manganite
Hotazel Mine, Kalahari Manganese Fields, South Africa
10.5 x 6 cm |
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| Viewed: |
31835 Time(s) |
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| Description: |
Hematite after Magnetite (Martite)
Payun Matru Volcano, Malargue, Mendoza, Argentina
9.5 x 3.9 x 3.7 cm |
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31806 Time(s) |
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Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
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| Posted: Nov 11, 2013 02:23 Post subject: Re: Don Lum Collection |
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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
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Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Nov 11, 2013 11:33 Post subject: Re: Don Lum Collection |
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Thank you, Pierre. I am fortunate to have both of these pieces. Hello to Riana.
Sincerely,
Don
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Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
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| Posted: Nov 11, 2013 12:08 Post subject: Re: Don Lum Collection |
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| Don Lum wrote: |
Thank you, Pierre. I am fortunate to have both of these pieces. Hello to Riana.
Sincerely,
Don |
Thank you Don:-)
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Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Nov 11, 2013 22:33 Post subject: Re: Don Lum Collection |
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Collection specimens
| Description: |
Hematite, Quartz
Rio Marina, Isola d'Elba, Italy
3.3 x 2.7 x 2 cm |
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| Viewed: |
31703 Time(s) |
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| Description: |
Hematite, Quartz
Rio Marina, Isola d'Elba, Italy
3.3 x 2.7 x 2 cm |
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| Viewed: |
31746 Time(s) |
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| Description: |
Baryte with inclusions
18 Mine, Paleokamariza Mines, Lavrion, Attiki, Greece
6.4 x 4.8 x 2.4 cm |
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| Viewed: |
31735 Time(s) |
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| Description: |
Hematite
Florence Mine, Egremont, England
9 x 7.5 cm |
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| Viewed: |
31678 Time(s) |
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| Description: |
Hematite
Florence Mine, Egremont, England
9 x 7.5 cm |
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| Viewed: |
31731 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Nov 12, 2013 14:49 Post subject: Re: Don Lum Collection |
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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.
| Description: |
Quartz (var Smoky), Novaculite
Runyon Mine, Hot Spring County, Arkansas, USA
14.2 x 11.4 x 11 cm
Coontail Quartz |
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| Viewed: |
31517 Time(s) |
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| Description: |
Quartz (var Smoky), Novaculite
Runyon Mine, Hot Spring County, Arkansas, USA
14.2 x 11.4 x 11 cm
Coontail Quartz |
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| Viewed: |
31457 Time(s) |
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| Description: |
Quartz (var Smoky), Novaculite
Runyon Mine, Hot Spring County, Arkansas, USA
14.2 x 11.4 x 11 cm
Coontail Quartz |
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| Viewed: |
31578 Time(s) |
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| Description: |
Quartz
Saline County, Arkansas, USA
12.2 x 10 cm |
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| Viewed: |
31475 Time(s) |
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| Description: |
Quartz
Saline County, Arkansas, USA
12.2 x 10 cm |
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| Viewed: |
31467 Time(s) |
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| Description: |
Quartz
Saline County, Arkansas, USA
12.2 x 10 cm |
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| Viewed: |
31531 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Nov 12, 2013 18:04 Post subject: Re: Don Lum Collection |
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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.
| Description: |
Quartz (irradiated)
Arkansas, USA
12.4 x 7.2 cm
Irradiated |
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| Viewed: |
31446 Time(s) |
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| Description: |
Quartz (irradiated)
Arkansas, USA
12.4 x 7.2 cm
Irradiated |
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| Viewed: |
31494 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Nov 14, 2013 17:02 Post subject: Re: Don Lum Collection |
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Collection
| Description: |
Fluorite, Quartz
Santa Gertrudis vein, Santa Librada, Mun. de Mapimí, Durango, Mexico
7.5 x 6.5 cm |
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| Viewed: |
31124 Time(s) |
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| Description: |
Skutterudite
Bou Azzer District, Anti-Atlas Mountains, Tazenakht, Ouarzazate Province, Souss-Massa-Draa Region, Morocco
6.5 x 6.4 cm |
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| Viewed: |
31090 Time(s) |
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| Description: |
Skutterudite
Bou Azzer District, Anti-Atlas Mountains, Tazenakht, Ouarzazate Province, Souss-Massa-Draa Region, Morocco
6.5 x 6.4 cm |
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| Viewed: |
31101 Time(s) |
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| Description: |
Fluorite, Quartz
Yaogangxian Mine, Hunan, China
10 x 9 cm |
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| Viewed: |
31078 Time(s) |
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| Description: |
Fluorite, Quartz
Yaogangxian Mine, Hunan, China
10 x 9 cm |
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| Viewed: |
31116 Time(s) |
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| Description: |
Fluorite, Quartz
Yaogangxian Mine, Hunan, China
10 x 9 cm |
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| Viewed: |
31086 Time(s) |
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| Description: |
Fluorite, Quartz
Yaogangxian Mine, Hunan, China
10 x 9 cm |
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| Viewed: |
31076 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Nov 16, 2013 13:41 Post subject: Re: Don Lum Collection |
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Light sensitive minerals
| Description: |
Proustite, Acanthite pseudomorph after Silver Wire
Uchucchuacua Mine, Oyon Province, Lima Department, Peru
6.2 x 4.3 cm |
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| Viewed: |
30965 Time(s) |
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| Description: |
Proustite, Acanthite pseudomorph after Silver Wire
Uchucchuacua Mine, Oyon Province, Lima Department, Peru
6.2 x 4.3 cm |
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| Viewed: |
30989 Time(s) |
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| Description: |
Proustite, Acanthite
Imiter Mine, Anti-Atlas Mountains, Souss-Massa-Draa, Morocco
4 x 3.3 x 2.2 cm |
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| Viewed: |
30978 Time(s) |
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| Description: |
Proustite, Galena
Harz Mountains, Lower Saxony, Germany
4.1 x 3.5 cm
ex Harvard Collection
ex Elling Collection |
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| Viewed: |
31015 Time(s) |
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| Description: |
Proustite, Galena
Harz Mountains, Lower Saxony, Germany
4.1 x 3.5 cm
ex Harvard Collection
ex Elling Collection |
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| Viewed: |
30994 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Nov 17, 2013 16:52 Post subject: Re: Don Lum Collection |
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Light sensitive minerals
| Description: |
Cinnabar, Dolomite
Tongren Mine, Washan District, Tongren Prefecture, Guizhou Province. China
5 x 3.7 cm |
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| Viewed: |
30859 Time(s) |
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| Description: |
Cinnabar, Dolomite
Tongren Mine, Washan District, Tongren Prefecture, Guizhou Province. China
5 x 3.7 cm |
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| Viewed: |
30882 Time(s) |
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| Description: |
Pyrargyrite
San Genaro Mine, Castrovirreyna Province, Huancavelica Department, Peru
2.7 x 2.5 cm |
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| Viewed: |
30843 Time(s) |
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| Description: |
Pyrargyrite
San Genaro Mine, Castrovirreyna Province, Huancavelica Department, Peru
2.7 x 2.5 cm |
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| Viewed: |
30871 Time(s) |
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| Description: |
Pyrargyrite, Calcite
Level 630 of the San Guillermo Vein, San Luis Shaft, Fresnillo, Zacatecas, Mexico
4.7 x 4.2 cm |
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| Viewed: |
30889 Time(s) |
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| Description: |
Spodumene variety Kunzite
Pech, Kunar Province, Afghanistan
6.6 x 6.5 cm |
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| Viewed: |
30859 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Nov 18, 2013 14:25 Post subject: Re: Don Lum Collection |
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Light sensitive minerals
| Description: |
Spodumene variey kunzite
Pech, Kunar Province, Afghanistan
6 x 4.3 cm
Kunzite floater with double termination |
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| Viewed: |
30789 Time(s) |
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| Description: |
Spodumene variey kunzite
Pech, Kunar Province, Afghanistan
6 x 4.3 cm
Kunzite floater with double termination |
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| Viewed: |
30805 Time(s) |
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| Description: |
Spodumene
Namacotche, Mutala, Mozambique
8 x 2.9 cm |
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| Viewed: |
30878 Time(s) |
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Mike Wood
Joined: 16 Dec 2010
Posts: 456
Location: Northern England
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| Posted: Nov 18, 2013 19:02 Post subject: Re: Don Lum Collection |
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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
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Nov 18, 2013 19:19 Post subject: Re: Don Lum Collection |
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| 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
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Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
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| Posted: Nov 19, 2013 01:37 Post subject: Re: Don Lum Collection |
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| 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:-)
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Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Nov 19, 2013 10:40 Post subject: Re: Don Lum Collection |
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| 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
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Mike Wood
Joined: 16 Dec 2010
Posts: 456
Location: Northern England
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| Posted: Nov 19, 2013 16:12 Post subject: Re: Don Lum Collection |
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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
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Nov 19, 2013 17:14 Post subject: Re: Don Lum Collection |
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| 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
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Mike Wood
Joined: 16 Dec 2010
Posts: 456
Location: Northern England
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| Posted: Nov 19, 2013 17:47 Post subject: Re: Don Lum Collection |
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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 : )
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Nov 19, 2013 18:09 Post subject: Re: Don Lum Collection |
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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
| 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 |
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| Viewed: |
30549 Time(s) |
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| 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 |
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| Viewed: |
30577 Time(s) |
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| Description: |
Realgar, Orpiment
Quiruvilla, Santiago de Chuco, La Libertad, Peru
6.6 x 5 cm |
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| Viewed: |
30593 Time(s) |
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| Description: |
Realgar, Orpiment
Quiruvilla, Santiago de Chuco, La Libertad, Peru
6.6 x 5 cm |
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| Viewed: |
30549 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2856
Location: Arkansas
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| Posted: Nov 19, 2013 19:05 Post subject: Re: Don Lum Collection |
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| 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
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