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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: May 18, 2017 23:17 Post subject: Re: Don Lum Collection |
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Quartz cabochon with copper sulfate liquid inclusions and bubbles
Mineral: | Quartz |
Locality: | Bahia, Northeast Region, Brazil | |
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Dimensions: | 22mm x 19.5mm x 8.8mm |
Description: |
Polished Quartz cabochon with copper sulfate liquid inclusions and bubbles |
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19500 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: May 19, 2017 17:12 Post subject: Re: Don Lum Collection |
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I don't have a subscription to Gems and Gemology but here is a reference from a contributor from Barcelona to gemologyonline.com https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=20&t=20987 and I quote:
Elena Andia
Post subject: Blue fluid inclusions in quartzPostPosted: Wed Mar 04, 2015 5:23 pm
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Joined: Fri Feb 20, 2015 6:00 pm
Posts: 15
Location: Barcelona (Spain)
Hi to everybody!
During our last trip to Brazil, we bought some colorless stones with blue fluid inclusions. Few days ago we analyzed one of the stones. With the distant vision method it could be observed a refractive index of 1.55 approximately. With the microscope it can be seen typical inclusions from natural gemstones (crystal inclusions, two-phase inclusions, etc.) and two blue fluid inclusions. Under long wave UV radiation this specimen displayed a bluish green fluorescence.
We were investigating and we found an issue of Gems & Gemology that talks about quartz with blue fluid inclusions (probably a saturated copper sulfate solution). Here you have the reference:
John I. Koivula, "Colored fluid inclusions in quartz", Gems and Gemology, Volume 42, Spring 2006, pages 71-72.
We think it is a very curious gemstone and we hope you like it.
What do you think about it?
End quote.
Cheers,
Don
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Tobi
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Joined: 07 Apr 2009
Posts: 4112
Location: Germany
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Posted: May 20, 2017 04:20 Post subject: Re: Don Lum Collection |
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Don Lum wrote: | Polished Quartz cabochon with copper sulfate liquid inclusions and bubbles | I really struggle to like a polished rock, but that one is quite interesting :-)
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: May 20, 2017 08:56 Post subject: Re: Don Lum Collection |
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Tobi wrote: | Don Lum wrote: | Polished Quartz cabochon with copper sulfate liquid inclusions and bubbles | I really struggle to like a polished rock, but that one is quite interesting :-) |
Tobi, thank you for your tolerance and understanding. I considered your feelings as well as those of Jordi and Carles before posting but decided that the larger FMF community would appreciate such a picture since it was alluded to in Roger's post and Cascaillou's comment.
Regards,
Don
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: May 29, 2017 15:12 Post subject: Re: Don Lum Collection |
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Smithsonite
Mineral: | Smithsonite after Dolomite |
Locality: | Monte Cristo Mine, Rush, Rush Creek District, Marion County, Arkansas, USA | |
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Dimensions: | 110 mm x 51 mm x 52 mm |
Description: |
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Viewed: |
19177 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: May 29, 2017 15:23 Post subject: Re: Don Lum Collection |
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Cerussite
Mineral: | Cerussite |
Locality: | Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia | |
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Dimensions: | 103 mm x 63 mm x 73 mm |
Description: |
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Viewed: |
19180 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: May 30, 2017 19:38 Post subject: Re: Don Lum Collection |
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Pyrite
Mineral: | Pyrite |
Locality: | Milpillas Mine, Cuitaca, Municipio Santa Cruz, Sonora, Mexico | |
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Dimensions: | 18 mm x 16 mm x 12 mm |
Description: |
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Viewed: |
19045 Time(s) |
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Mineral: | Pyrite |
Locality: | San Manuel Mine, San Manuel, San Manuel District, Pinal County, Arizona, USA | |
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Dimensions: | 14 mm x 12 mm x 12 mm |
Description: |
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Viewed: |
19090 Time(s) |
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Tobi
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Posted: May 31, 2017 10:10 Post subject: Re: Don Lum Collection |
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Very uncommon and interesting pyrite crystals, Don!
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Fiebre Verde
Joined: 11 Sep 2013
Posts: 942
Location: Paris Area
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Posted: May 31, 2017 11:37 Post subject: Re: Don Lum Collection |
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Tobi wrote: | Very uncommon and interesting pyrite crystals, Don! |
yes, very!
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: May 31, 2017 12:03 Post subject: Re: Don Lum Collection |
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Thank you very much for your comments Tobi and Gérard.
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: Jun 03, 2017 15:00 Post subject: Re: Don Lum Collection |
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Mimetite
Mineral: | Mimetite |
Locality: | Guatomo Mine (Hat Yai), Tham Thalu, Bannang Sata District, Yala Province, Thailand | |
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Dimensions: | 21 mm x 13 mm x 8 mm |
Description: |
Hoppered Mimetite crystal |
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Viewed: |
18702 Time(s) |
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Mineral: | Mimetite |
Dimensions: | 21 mm x 13 mm x 8 mm |
Description: |
Hoppered Mimetite crystal |
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Viewed: |
18670 Time(s) |
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Mineral: | Mimetite |
Dimensions: | 21 mm x 13 mm x 8 mm |
Description: |
Hoppered Mimetite crystal |
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Viewed: |
18694 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: Jun 03, 2017 22:30 Post subject: Re: Don Lum Collection |
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Previously posted, better pictures
Mineral: | Rhodochrosite, Copper |
Locality: | Wolf Mine, Herdorf, Siegerland, Rhineland-Palatinate/Rheinland-Pfalz, Germany | |
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Dimensions: | 45 mm x 50 mm x 27 mm |
Description: |
Rhodochrosite with Native Copper on Limonite ex Howard Belsky ex Norman E. Dawson collected pre-1910 |
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18661 Time(s) |
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Mineral: | Rhodochrosite, Copper |
Locality: | Wolf Mine, Herdorf, Siegerland, Rhineland-Palatinate/Rheinland-Pfalz, Germany | |
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Dimensions: | 45 mm x 50 mm x 27 mm |
Description: |
Rhodochrosite with Native Copper on Limonite ex Howard Belsky ex Norman E. Dawson collected pre-1910 |
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Viewed: |
18682 Time(s) |
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Tobi
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Joined: 07 Apr 2009
Posts: 4112
Location: Germany
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Posted: Jun 04, 2017 08:05 Post subject: Re: Don Lum Collection |
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Don Lum wrote: | Previously posted, better pictures | A perfect specimen of Germany's (and maybe even Europe's) most famous rhodochrosites, superb crystals!
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: Jun 04, 2017 11:05 Post subject: Re: Don Lum Collection |
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Tobi wrote: | Don Lum wrote: | Previously posted, better pictures | A perfect specimen of Germany's (and maybe even Europe's) most famous rhodochrosites, superb crystals! |
Thank you very much, Tobi. I consider you an expert on German minerals so I consider your words as a high compliment.
Regards,
Don
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: Jun 04, 2017 11:24 Post subject: Re: Don Lum Collection |
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Don Lum wrote: | Tobi wrote: | Don Lum wrote: | Previously posted, better pictures | A perfect specimen of Germany's (and maybe even Europe's) most famous rhodochrosites, superb crystals! |
Thank you very much, Tobi. I consider you an expert on German minerals so I consider your words as a high compliment.
Regards,
Don |
I should have described this specimen as scalenohedrons of rhodochrosite with patinaed native copper in a vug with limonite.
Don
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Tobi
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Posted: Jun 05, 2017 02:17 Post subject: Re: Don Lum Collection |
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Don Lum wrote: | Tobi wrote: | A perfect specimen of Germany's (and maybe even Europe's) most famous rhodochrosites, superb crystals! | Thank you very much, Tobi. I consider you an expert on German minerals so I consider your words as a high compliment. Regards, Don | Thanks, Don. Maybe not an expert, but someone who loves German minerals and whose knowledge about them may be slightly above average :-)
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: Jun 09, 2017 15:15 Post subject: Re: Don Lum Collection |
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Smithsonite from good ole Arkansas
one repeat but better picture
Mineral: | Smithsonite after Dolomite |
Locality: | Monte Cristo Mine, Rush, Rush Creek District, Marion County, Arkansas, USA | |
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Dimensions: | 110 mm x 51 mm x 52 mm |
Description: |
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Viewed: |
18370 Time(s) |
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Mineral: | Smithsonite, Quartz |
Locality: | Monte Cristo Mine, Rush, Rush Creek District, Marion County, Arkansas, USA | |
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Dimensions: | 49 mm x 34 mm x 21 mm |
Description: |
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Viewed: |
18344 Time(s) |
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: Jun 10, 2017 22:38 Post subject: Re: Don Lum Collection |
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Chrysoberyl (variety Alexandrite)
Mineral: | Chrysoberyl (variety Alexandrite) |
Locality: | Novello Mine, Masvingo (Fort Victoria), Masvingo District, Masvingo Province, Zimbabwe | |
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Dimensions: | 34 mm x 24 mm x 17 mm |
Description: |
Sixling Twin, incandescent |
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Viewed: |
18247 Time(s) |
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Mineral: | Chrysoberyl (variety Alexandrite) |
Locality: | Novello Mine, Masvingo (Fort Victoria), Masvingo District, Masvingo Province, Zimbabwe | |
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Dimensions: | 34 mm x 24 mm x 17 mm |
Description: |
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Viewed: |
18227 Time(s) |
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Michael Shaw
Site Admin
Joined: 30 Apr 2008
Posts: 2088
Location: Oklahoma
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Posted: Jun 11, 2017 15:08 Post subject: Re: Don Lum Collection |
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We looked through quite a few of these in Tucson. Most were poorly crystallized and failed to demonstrate a good color change. Yours is nice on both counts - congrats.
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Don Lum
Joined: 03 Sep 2012
Posts: 2869
Location: Arkansas
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Posted: Jun 11, 2017 15:56 Post subject: Re: Don Lum Collection |
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crosstimber wrote: | We looked through quite a few of these in Tucson. Most were poorly crystallized and failed to demonstrate a good color change. Yours is nice on both counts - congrats. |
Thank you, Michael. I took a few more pictures of this specimen today and if they are better, I will post later.
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