URAL MINERALOGICAL FESTIVAL, July 3 to 21, 2019, in Yekaterinburg City, Ural region, Russia
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 Post subject: Mineral Specimen from a Geologist's estate
PostPosted: Sun May 12, 2013 4:17 pm 
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I haven't been able to figure out what this is. The hardness is between 5 and 6, the streak color is light brown, the luster is metallic, the crystals are opaque and look black with a slight "root beer" color on broken edges, with white quartz flowers. The geologist spent a lot of time collecting in Alaska and lived in WA but has samples of mostly ores from foreign locales. Any thoughts? I was thinking tetrahedrite or sphalerite but things don't quite fit...
edit: I'm going to revise the hardness to between 3.5 and 4

Thanks, Sally

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 Post subject: Re: Mineral Specimen from a Geologist's estate
PostPosted: Sun May 12, 2013 7:39 pm 
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Sphalerite from Peru.


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 Post subject: Re: Mineral Specimen from a Geologist's estate
PostPosted: Mon May 13, 2013 9:52 am 
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Thanks Icehut. That seems to be the general consensus on the geology forum too. It is a lovely little specimen.

Sally


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