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Formula: Pb5(As3+O3)3Cl
Arsenite containing halogen
Crystal System: Hexagonal
Specific gravity: 7.265 measured, 7.35 calculated
Hardness: 2½
Streak: Grey
Colour: Grey to black; pale olive-green in transmitted light
Environments
Finnemanite is a very rare mineral.
Localities
At the type locality, Långban, Filipstad, Värmland County, Sweden, finnemanite occurs in crevices in
hematite in a metamorphosed iron-manganese orebody. Associated minerals include
hematite, rouseite and
trigonite
(HOM, Mindat).
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