Purpurite
(repeating unit)Mn3+PO4 IMA symbol Pur[1] Strunz classification 8.AB.10 Crystal system Orthorhombic Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m) Space group Pnmb Identification Formula mass 149.91 g/mol Color Brownish black, violet, dark pink, dark red, reddish purple Crystal habit Massive to granular Cleavage [100] [001] perfect Fracture Uneven Tenacity Brittle Mohs scale hardness 4–5 Luster Earthy Streak red Specific gravity 3.2 – 3.4 Optical properties Biaxial (+) Refractive index nα = 1.850(2) nβ = 1.860(2) nγ = 1.920(2) Birefringence δ = 0.070 2V angle 38° References [2][3][4]
H-M symbol: (2/m 2/m 2/m)
Purpurite is a manganese phosphate mineral with the formula MnPO4, with varying amounts of iron depending upon its source. It occurs in color ranges from brownish black via purple and violet to dark red.[3]
Purpurite forms a series with the iron-bearing endmember heterosite, FePO4.[4]
See also
- Manganese violet
References
Wikimedia Commons has media related to Purpurite.
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Manganese minerals
Simple | |
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Mixed |
- Axinite (borosilicate)
- Geigerite (arsenate)
- Manganese nodule (various)
- Samsonite (sulfosalt)
- Zincobotryogen (sulfate)
- Wolframite (tungstate)
- Hübnerite (tungstate)
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