Rouseite

rouseite

trigonite

finnemanite

hausmannite

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Formula: Pb2Mn2+(AsO3)2.2H2O
Arsenite
Specific gravity: 5.73 calculated
Hardness: 3
Streak: Light yellow
Colour: Yellow orange
Environments

Metamorphic environments

Rouseite is an extremely rare mineral which has been found only from the type locality to date (July 2020).

Localities

The type locality is Långban, Filipstad, Värmland County, Sweden. Rouseite has been found on a single museum specimen from this locality, which was collected many years ago. The matrix is a banded calcite - hausmannite ore, and secondary minerals are deposited on a fracture surface that cuts across the ore banding. The assemblage is an intimate mixture of calcite, trigonite and rouseite. Two generations of finnemanite are present. Some trigonite appears to have been replaced by rouseite (AM 71.1034-1036).

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