Outstanding golden yellow crystals of the extremely rare Au, Ag, Hg natural alloy weishanite associated to red deep proustite and pyrargyrite. From: Homestake Claim, Creede, Mineral County, Colorado, United States of America. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Weishanite
Weishanite is an IMA-recognized mineral species in the native element class, with the chemical formula (Au,Ag,Hg).
It crystallizes in the hexagonal crystal system (space group P6_3/mmc).
Key properties: Mohs hardness 2.4; specific gravity 18.17; Metallic luster.
IMA symbol Whn, IMA status: approved, named in 1982.
Found in the silicified zone of the silver-rich part of an Au-Ag deposit in biotite granulite.
It is found associated with Gold, silver, acanthite, pyrite, galena, sphalerite, pyrrhotite, scheelite.
Derivation not stated.