uytenbogaardtite

 The mineral uytenbogaardtite, Ag₃AuS₂, is a soft, greyish white sulfide mineral, occurring in hydrothermal Au-Ag-quartz veins. It occurs as tiny crystals, visible only with a microscope. It has a metallic luster and a hardness on the Mohs scale of 2 (gypsum).

Uytenbogaardite
Uytenbogaardtite, from New Bullfrog Mine, Nye County, Nevada, United States of America
General
Category	Sulfide mineral
Formula (repeating unit)	Ag3AuS2
Strunz classification	2.BA.40b
Crystal system	Trigonal
Crystal class	Ditrigonal pyramidal (3m) H-M symbol: (3m)
Space group	R3c
Identification
Formula mass	584.70 g/mol
Color	Greyish white
Crystal habit	Microscopic crystals
Mohs scale hardness	2
Luster	Metallic
Diaphaneity	Opaque
References

It forms, together with petzite (Ag₃AuTe₂) and fischesserite (Ag₃AuSe₂) the uytenbogaardtite group. The type locality is Tambang Sawah, Bengkulu district, Sumatra island, Indonesia.

It is named after the Dutch mineralogist Willem Uytenbogaardt (1918–2012), Professor of Geology, Technical University, Delft, The Netherlands, prominent ore microscopist.

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.