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n.1.(Min.) A hydrous sulphate of iron of a deep red color. It often occurs in botryoidal form.
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Associated minerals include botryogen, copiapite, anhydrite, gypsum, melanterite, marcasite and sulfur.
A relatively rare secondary mineral, botryogen occurs as thin, orange-yellow crusts up to several square centimeters in area in the Andrassy III section, associated with epsomite, melanterite and copiapite (Szakall et al.
Also in his stock were colorful (but unfortunately unstable) fine crystals of the iron sulfates voltaite, coquimbite and botryogen.