Wiktionary
galkhaite
n. (context mineral English) An isometric-hextetrahedral mineral containing antimony, arsenic, cesium, copper, mercury, sulfur, thallium, and zinc.
Wikipedia
Galkhaite
Galkhaite is a rare and chemically complex sulfosalt mineral from a group of natural thioarsenites. Its formula is (Cs,Tl)(Hg,Cu,Zn)(As,Sb)S, making the mineral the only known natural Cs-Hg and Cs-As phase. It occurs in Carlin-type hydrothermal deposits.