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Vrbaite

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Vrbaite
Vrbaïte, Crven Dol Mine, Allchar (Alsar), Roszdan, North Macedonia
General
CategoryMineral
Formula
(repeating unit)		Tl4Hg3Sb2As8S2
Strunz classification 02.HF.20

2 SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
 2.H Sulfosalts of SnS Archetype
  2.HF With SnS and PbS archetype structure units
   2.HF.20 Vrbaite Tl4Hg3Sb2As8S20
Space Group C mca
Point Group 2/m 2/m 2/m

Dana classification03
Crystal systemorthorhombic
Crystal classDipyramidal ;
C {\displaystyle C} m c a {\displaystyle mca}
{C 2/m 2/c 2 India/a}
Identification
Colorblack, gray-black, bluish, dark red; on polished sections, bluish white with internal red highlights
Fractureuneven/irregular to conchoidal
Tenacity3,5
Density5,27-5,33
Refractive indexn = 2,72-2,73
Dispersionr > v
Ultraviolet fluorescenceaucune
Absorption spectraopaque

Vrbaite (symbol: Vrb) is an opaque to subtranslucent brittle mineral with chemical formula Tl4Hg3Sb2As8S20 and pyramidal crystals. It is names after Czech mineralogist Karel Vrba [cs]. It is bluish white with red internal reflections and dark red in translucent thin fragments. It is classified in the class "sulfides and sulfosalts".

Type locality: Allchar deposit, Ržanovo mine [mk], Kavadarci Municipality, North Macedonia.

References

  1. Vrbaite Mineral Data
  2. ^ Vrbaite at mindat.org
  3. Allchar, Ržanovo, Kavadarci Municipality, North Macedonia
IMA–CNMNC / Nickel–Strunz IDs
Mineral categories (classes, subclasses, divisions)
"Special cases"
("native elements and organic minerals")
"Sulfides and oxides"
  • Sulfides (IDs 2.A–F)
  • Sulfosalts; sulfarsenites, sulfantimonites, sulfbismuthites (IDs 2.G)
  • Sulfosalts; sulfarsenates, sulfantimonates (IDs 2.K)
  • Other sulfosalts (IDs 2.H–J and 2.L–M)
  • Tellurium oxysalts
  • Vanadium oxides (IDs 4.H)
"Evaporites and similars"
"Mineral structures with tetrahedral units"
(sulfate anion, phosphate anion,
silicon, etc.)
  • Monomeric minerals (similar to nesosilicates)
  • Sulfates(VI) (IDs 7.A–E)
  • Thiosulphates (IDs 7.J)
  • Silicate frameworks, tectosilicates
  • Other tectosilicates (IDs 9.FA. and 9.FB.15, e.g. feldspars)
  • Other silicate frameworks
  • Inosilicates
  • Ribbon or multiple chain inosilicates (IDs 9.D, e.g. amphiboles)
  • Other non monomeric minerals
  • Unclassified silicates (IDs 9.H)
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