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Mineralpedia Details for Emmonsite

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Emmonsite

Emmonsite

Named after Samuel Franklin Emmons, an American economic geologist formerly at the United States Geological Survey. Emmonsite is an uncommon mineral that occurs as a product of the alteration of tellurium minerals in oxidized, hydrothermal precious metal deposits. Localities for Emmonsite are in the United States including in the Clinton mine here in the Black Hills of South Dakota, Mexico, Honduras, Chile, and Armenia, among a few others.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/emmonsite.pdf

Formula
Fe3+2(Te4+O3)3ยท2H2
Crystal System
Triclinic 
Crystal Habit
Mammillary 
Cleavage
Perfect, None, None 
Luster
Vitreous - Dull 
Color
yellow, greenish yellow 
Class
Triclinic - Pinacoidal 
Hardness
2-2.5 
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Mindat
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Emmonsite from Goldfield, Esmeralda Co., Nevada, United States

Emmonsite
            from Goldfield, Esmeralda Co., Nevada, United States

Very rich specimen with a lot of small pockets filled with bright to dark green Emmonsite crystals with plumose to radial habits. Some crystals are slightly yellow and bladed and may be perhaps another species. Within the matrix are metallic, silvery crystals, perhaps Antimony. 

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Emmonsite from Moctezuma mine, Moctezuma, Sonora, Mexico

Emmonsite
            from Moctezuma mine, Moctezuma, Sonora, Mexico

Worm-like growths of Emmonsite to under 1mm.

Worm-like growths of Emmonsite. The largest cluster is 3mm wide.

Tiny strings of Emmonsite crystals on first generation bright green crusts of Emmonsite.

 

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Emmonsite from Moctezuma, Sonora, Mexico

Emmonsite
            from Moctezuma, Sonora, Mexico

Green worm-like crystals in groups to 0.5mm.

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