Erniggliite
Erniggliite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Tl₂SnAs₂S₆.
It crystallizes in the hexagonal crystal system (space group P-3).
Key properties: Mohs hardness 2–3; specific gravity 5.24; Reddish black streak; “Shiny” on cleavage surfaces luster.
IMA symbol Eni, IMA status: approved, named in 1987.
Found in a hydrothermal deposit in dolostone.
It is found associated with Hutchinsonite, hatchite, wallisite, lorandite, bernardite, realgar, orpiment, edenharterite, stalderite.
In honor of Professor Emeritus Ernie Niggli (1917-), mineralogist and petrologist, University of Bern, Bern, Switzerland.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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