Hemusite

Hemusite is a very rare isometric gray mineral containing copper, molybdenum, sulfur, and tin with chemical formula Cu₆SnMoS₈.[1] It was discovered by Bulgarian mineralogist Georgi Terziev in 1963. He also described it and named it after Haemus, the ancient name of Stara planina (Balkan) mountains in Europe. The type locality is Chelopech copper ore deposit, Bulgaria.[3] Later tiny deposits of hemusite were found in Ozernovskoe deposit, Kamchatka, Russia; Kawazu mine, Rendaiji, Shimoda city, Chūbu region, Honshu Island, Japan; Iriki mine, Iriki, Satsuma-gun, Kagoshima Prefecture, Kyushu Region, Japan; Kochbulak deposit, Tashkent, Uzbekistan.[6] Hemusite occurs as rounded isometric grains and aggregates usually about 0.05 mm in diameter and in association with enargite, luzonite, colusite, stannoidite, renierite, tennantite, chalcopyrite, pyrite, and other minerals.

Hemusite
Hemusite from Kawazu mine, Japan at National Natural History Museum, Sofia, Bulgaria
General
Category	Sulfosalt minerals, Sulfides
Formula (repeating unit)	Cu6SnMoS8
Strunz classification	2.CB.35a (10 ed) 2/C.09-10 (8 ed)
Dana classification	2.9.6.1
Crystal system	Isometric
Identification
Color	gray
Mohs scale hardness	4
Luster	metallic
Diaphaneity	Opaque
Density	4.469
References	[1][2][3][4][5]