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Collection of Carles Millan
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Carles Millan
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PostPosted: Dec 06, 2016 16:44    Post subject: Re: Collection of Carles Millan  

I forgot. Sorry!

The human visible spectrum includes wavelengths from about 390 nm to 700 nm. We cannot see light from below and above such range (which would be UV and IR light respectively). Other animal species can see slightly different wavelengths. But the range that the cameras see must be even more different. Not to mention the big difference of resolutions. So it's no surprise that the photos we get don't match the images we directly see.
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Carles Millan
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PostPosted: May 23, 2017 09:19    Post subject: Collection of Carles Millan - Cassiterite from Bolivia  

Cassiterite, quartz

Group of honey-brown, translucent when backlit, cassiterite crystals set on a matrix of crystallized quartz. Several of them are twinned. No damage. Overall size: 98 mm x 90 mm x 72 mm. Main cassiterite crystal: 40 mm wide. Weight: 955 g.

Unless otherwise noted, all photos are copyright by Carles Millan. Reproduction allowed as long as the author's name is cited and the image not modified (if it is not too much to ask...). Creative Commons Attribution Licence - Some Rights Reserved.

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4451M-cassiterite1.jpg
 Mineral: Cassiterite, Quartz
 Locality:
Viloco Mine, Loayza Province, La Paz Department, Bolivia
 Dimensions: 98 mm x 90 mm x 72 mm. Main cassiterite crystal: 40 mm wide
 Description:
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4451M-cassiterite1.jpg



4451M-cassiterite2.jpg
 Mineral: Cassiterite, Quartz
 Locality:
Viloco Mine, Loayza Province, La Paz Department, Bolivia
 Dimensions: 98 mm x 90 mm x 72 mm. Main cassiterite crystal: 40 mm wide
 Description:
 Viewed:  1306 Time(s)

4451M-cassiterite2.jpg


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Tobi




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PostPosted: May 23, 2017 13:00    Post subject: Re: Collection of Carles Millan - Cassiterite from Bolivia  

Carles Millan wrote:
Cassiterite, Quartz
Locality: Viloco Mine, Loayza Province, La Paz Department, Bolivia
As usual, a splendid specimen and a great photo - I guess cassiterite is not easy to photograph. But what are the green/blue areas on the matrix, a copper mineral?
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PostPosted: May 24, 2017 03:24    Post subject: Re: Collection of Carles Millan - Cassiterite from Bolivia  

Tobi wrote:
As usual, a splendid specimen and a great photo - I guess cassiterite is not easy to photograph. But what are the green/blue areas on the matrix, a copper mineral?

Thank you, Tobi.

Regarding the blue areas, I don't know what they are, but I consider them as negligible. Probably something like Blu-Tack from the previous owner. I'll try to clean them.
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