vrbaite
Sign in to saveVrbaite (symbol: Vrb) is an opaque to subtranslucent brittle mineral with chemical formula Tl4Hg3Sb2As8S20 and pyramidal crystals. It is names after Czech mineralogist . It is bluish white with red internal reflections and dark red in translucent thin fragments. It is classified in the class "sulfides and sulfosalts".
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{{Infobox mineral | name = Vrbaite | nameIUPAC = | strunz = | dana = 03.07.15.01 | largeurbox = | image = Vrbaite-91144.jpg | imagesize = 280 | caption = Vrbaïte, Crven Dol Mine, Allchar (Alsar), Roszdan, North Macedonia | formula = Tl4Hg3Sb2As8S2
| color = black, gray-black, bluish, dark red; on polished sections, bluish white with internal red highlights | class = Dipyramidal ; C mca{C 2/m 2/c 2/a} | system = orthorhombic | fracture = uneven/irregular to conchoidal | tenacity = 3,5
Excerpted from Wikipedia’s “vrbaite” article, available under the CC BY-SA 4.0 licence.