Eckerite
Eckerite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula Ag₂CuAsS₃.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Xanthoconite structural group.
Key properties: Mohs hardness 2.5–3; specific gravity 5.313; Orange-red streak; Adamantine to metallic luster.
IMA symbol Ekr, IMA status: approved, named in 2014.
Found in massive to interstitial sulfosalt accumulations in dolostones metamorphosed to upper greenschist to lower amphibolite facies.
It is found associated with Realgar, sinnerite, hatchite, trechmannite, smithite, dolomite.
The mineral was named to honor Markus Ecker (b. 1966), an expert on the minerals of Lengenbach quarry.
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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