Triploidite
4+1⁄2 – 5Luster Adamantine, vitreous, greasy Streak White, off-white. Diaphaneity Transparent, translucent Specific gravity 3.70 measured Optical properties Biaxial (+) Refractive index nα = 1.725 nβ = 1.726 nγ = 1.730 Birefringence δ = 0.005 Pleochroism Weak Dispersion r > v strong Solubility Soluble in acids. References [2][3][4] 
Triploidite is an uncommon manganese iron phosphate mineral with formula: (Mn, Fe)2PO4OH. It crystallizes in the monoclinic crystal system and typically occurs as elongated and striated slender prisms which may be columnar to fibrous. Its crystals may be pinkish to yellowish brown or red-orange.[2]
It was first described in 1878 for an occurrence in the Branchville Quarry, Branchville, Fairfield County, Connecticut. The name is derived from its resemblance to triplite.[3]
It typically occurs as a hydrothermal alteration product of primary phosphate minerals in granite pegmatites. It occurs with triplite, lithiophilite, triphylite, eosphorite, dickinsonite and rhodochrosite.[2][4]
It forms a solid solution series with the iron rich wolfeite.[3][4]
See also
Earth sciences portal
- Classification of minerals
- List of minerals
References
Wikimedia Commons has media related to Triploidite.
- ^ 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.
- ^ a b c Handbook of Mineralogy
- ^ a b c Mindat
- ^ a b c Webmineral data
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| Simple | |
|---|---|
| Mixed |
- Axinite (borosilicate)
- Geigerite (arsenate)
- Manganese nodule (various)
- Samsonite (sulfosalt)
- Zincobotryogen (sulfate)
- Wolframite (tungstate)
- Hübnerite (tungstate)
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