Weissbergite

weissbergite

stibnite

thallium

Carlin gold mine

Images

Formula: TlSbS₂
Valence: Tl¹⁺Sb³⁺S^2-₂
Sulphantimonite of thallium
Crystal system: Triclinic
Specific gravity: 5.79 measured, 6.22 calculated
Hardness: 1½
Streak: Dark grey
Colour: Steel-grey
Environments

Sedimentary environments
Hydrothermal environments

Localities

At the type locality, the Carlin Gold mine, Elko, Lynn Mining District, Eureka County, Nevada, USA, weissbergite occurs as irregular, broken or fractured grains, 0.5 mm in maximum dimension. It is opaque, steel-grey in thick plates, and with a bright metallic lustre on fresh surfaces. It displays several cleavages: one perfect, two excellent and at least one, good (AM 63.720-724).
Weissbergite occurs in late-stage hydrothermal veins that brecciate silicified dolomitic carbonate rocks. The assemblage appears to fill open space between breccia fragments and to have been formed during the boiling stage at the end of the hydrothermal episode. Associated minerals include stibnite and quartz (HOM).

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