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Formula: Ag2Pb12-xTlx/2As18+x/2S40
Sulphosalt, sulpharsenite,
sartorite group,
thallium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 5.33 to 5.41 measured, 5.31 calculated
Hardness: 3
Streak: Chocolate brown
Colour: Silver to lead-grey, tarnishes iridescent
Environments
Metamorphic environments
Hydrothermal environments
Rathite occurs in crystalline dolostone with other
lead-arsenic-sulphur
minerals. Associated minerals include liveingite,
baumhauerite, sartorite,
hutchinsonite, dufrénoysite,
tennantite and pyrite.
(HOM).
Localities
The type locality is the Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland.
Rathite from the Lengenbach Quarry -
Image
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