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Formula: BaAl3(SO4)(AsO4)(OH)6
Arsenate,
beudantite group,
barium-bearing mineral
Crystal System: Hexagonal
Hardness: 5
Colour: White to yellow or green
Solubility: Scarcely attacked by nitric or hydrochloric acid, dissolved by hot sulphuric acid (AM 47.415)
Environments
Localities
At the type locality, the Michael mine, Weiler, Seelbach, Seelbach, Ortenaukreis, Freiburg Region, Baden-Württemberg,
Germany, weilerite occurs as a white earthy crust, associated with
adamite and
mimetite, on chert and
baryte
(AM 47.415).
The Michael adit is inaccessible now, and the dump has been landscaped.
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