Compound sulphate, ettringite group
Specific gravity: 1.847
Streak: Pale yellow, greenish yellow, brownish orange (altered)
Colour: Bright Yellow to amber
Sturmanite is an uncommon secondary mineral occurring in
cavities in metamorphosed bedded manganese deposits, associated with baryte,
manganite, hausmannite and
At the type locality, the Black Rock mine, near Kuruman, Northern Cape, South Africa, sturmanite pseudomorphs after baryte and after gypsum have been found (KL p194, 195). Associated minerals include baryte and hematite (Dana).
At the NChwaning mine, Kalahari manganese fields, South Africa, rhodochrosite pseudomorphs after sturmanite have been found (KL p164).
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