Moschellandsbergite

Moschellandsbergite is a rare isometric mineral made up of a silver-white amalgam of mercury and silver with the chemical makeup Ag₂Hg₃.

Moschellandsbergite
General
Category	Metals and intermetallic alloys
Formula	silver amalgam, Ag2Hg3
IMA symbol	Mlb[1]
Strunz classification	1.AD.15d
Crystal system	Isometric
Crystal class	Tetartoidal (23) (same H-M symbol)
Space group	I23
Unit cell	a = 10.04 Å, Z = 10
Identification
Color	white, tarnishes grey
Cleavage	brittle
Mohs scale hardness	3.5
Luster	metallic
Specific gravity	13.48
References	[2][3][4][5]

It was first described in 1938 and named after Moschellandsberg Mountain near Obermoschel, Rhineland-Palatinate, Germany.^[4][6] It is considered a low-temperature hydrothermal mineral which occurs with metacinnabar, cinnabar, mercurian silver, tetrahedrite–tennantite, pyrite, sphalerite and chalcopyrite.^[3]