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Formula: Tl2SnAs2S6
Sulphosalt, arsenic-, tellurium-
and tin- bearing mineral
Crystal System: Trigonal
Specific gravity: 5.24 calculated
Hardness: 2 to 3
Streak: Reddish black
Colour: Steel-grey to black-grey
Environments
Although erniggliite was approved in 1987, to date (December 2022) it has been reported only from the type
locality.
Localities
At the type locality, the Lengenbach Quarry, Fäld, Binn, Goms, Valais, Switzerland, erniggliite occurs in a
hydrothermal deposit in dolostone. Associated minerals include
hutchinsonite, hatchite,
wallisite, lorándite,
bernardite, realgar,
orpiment, edenharterite and
stalderite
(HOM).
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