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Purpurite 3341.jpg
Category Phosphate minerals
(repeating unit)
Strunz classification 08.AB.10
Formula mass 149.91
Color Brownish black, violet, dark pink, dark red, reddish purple
Crystal habit Massive to granular
Crystal system Orthorhombic (2/m 2/m 2/m) Space Group: P nmb
Cleavage [100] [001] perfect
Fracture Brittle - uneven
Mohs scale hardness 4-5
Luster Earthy
Streak red
Specific gravity 3.2 - 3.4
Optical properties Biaxial (+) 2V 38°
Refractive index nα = 1.850(2) nβ = 1.860(2) nγ = 1.920(2)
Birefringence δ = 0.070
Other characteristics non-radioactive, non-magnetic, non-fluorescent.
References [1][2]

Purpurite is a mineral, basically manganese phosphate, MnPO4 although with varying amounts of iron depending upon the source of the mineral. It is a striking pink purple color as might be expected of a manganese-containing mineral.[1]

Purpurite forms a series with the iron bearing endmember heterosite, FePO4.[2]


  1. ^ a b "Purpurite". Webminerals. Retrieved 2009-06-06. 
  2. ^ a b Mindat