Meta-alunogen

meta-alunogen

alunogen

pickeringite

kalinite

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Formula: Al2(SO4)3.14H2O
Hydrated normal sulphate
Specific gravity: 2.85 calculated
Colour: White, pale yellow
Environments

Hydrothermal environments

Meta-alunogen is an uncommon mineral formed by dehydration of alunogen, hence the "meta" prefix; it is found in sulphate-rich hydrothermal deposits and geothermal fields. Associated minerals include alunogen, pickeringite, halotrichite, mirabilite, kalinite and gypsum (HOM).

Localities

At the type locality, Francisco de Vergara, Oficina María Elena, María Elena, Tocopilla Province, Antofagasta, Chile, alunogen occurs with pickeringite in veins in altered andesite; where exposed, the alunogen dehydrates readily to meta-alunogen. Associated minerals include pickeringite, mirabilite, kalinite, halotrichite, gypsum and alunogen (AM 28.61-62, Mindat).

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