Hydrated normal arsenate
Specific gravity: 3.70
Hardness: 3 to 3½
Streak: Pale green
Colour: Light green to sea green
Solubility: Soluble in dilute hydrochloric acid
Geminite occurs as coatings on quartz
At the Salsigne mine, Salsigne, Carcassonne, Aude, Occitanie, France, geminite occurs on specimens from mine dumps at the gold-bearing arsenic sulphide deposit, associated with lindackerite, yvonite, arsenopyrite, bismuth, chalcopyrite and pushcharovskite (HOM).
At the type locality, Cap Garonne Mine, Le Pradet, Var, Provence-Alpes-Côte d'Azur, France, geminite occurs on quartz in an arsenic-bearing oxidised lead-copper deposit. Associated minerals include tennantite, covellite, chalcanthite, lavendulan, pushcharovskite, antlerite and brochantite (AM 77.671, HOM).
At the Khder Mine, Amerzgane, Ouarzazate Province, Drâa-Tafilalet Region, Morocco, geminite has been found as typical twins to 0.5 mm in a weathered piece of löllingite which mainly contained scorodite crusts and spherules of schneiderhöhnite (Minrec 38.5.375).
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