Purpurite

(repeating unit)Mn3+PO4IMA symbolPur[1]Strunz classification8.AB.10Crystal systemOrthorhombicCrystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)Space groupPnmbIdentificationFormula mass149.91 g/molColorBrownish black, violet, dark pink, dark red, reddish purpleCrystal habitMassive to granularCleavage[100] [001] perfectFractureUnevenTenacityBrittleMohs scale hardness4–5LusterEarthyStreakredSpecific gravity3.2 – 3.4Optical propertiesBiaxial (+)Refractive indexnα = 1.850(2) nβ = 1.860(2) nγ = 1.920(2)Birefringenceδ = 0.0702V angle38°References[2][3][4]

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

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Mineralienatlas
  3. ^ a b "Purpurite". Webminerals. Retrieved 2009-06-06.
  4. ^ a b Mindat
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