Marrite

marrite

lengenbachite

rathite

sartorite

Images

Formula: AgPbAsS₃
Valence: Ag¹⁺Pb²⁺As³⁺S^2-₃
Sulpharsenite of silver and lead, freieslebenite group
Crystal system: Monoclinic
Specific gravity: 5.822 calculated
Hardness: 3
Streak: Black with a chocolate-brown tint
Colour: Lead-grey, steel-grey; often iridescent due to tarnish, red internal reflections
Environments

Hydrothermal environments

Localities

At the type locality, the Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland, marrite is of hydrothermal origin, occurring in dolostone as highly modified crystals, usually doubly terminated, and tarnished with red, yellow and blue colours. Associated minerals include lengenbachite, rathite, tennantite and sartorite (HOM, Mindat).
Marrite from the Lengenbach Quarry - Image

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