Triphylite
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General | |
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Category | Phosphate minerals |
Formula (repeating unit) | LiFe2+PO4 |
Strunz classification | 8.AB.10 |
Crystal system | Orthorhombic |
Space group | Orthorhombic - dipyramidal H-M symbol: (2/m 2/m 2/m) Space group: Pmnb |
Identification | |
Color | Green–blue gray, brown–black |
Crystal habit | Massive, granular, prismatic |
Cleavage | {100} perfect, {010} imperfect, {011} poor |
Fracture | Uneven–subconchoidal |
Mohs scale hardness | 4–5 |
Luster | Vitreous–subresinous |
Streak | White–grayish white |
Diaphaneity | Transparent–translucent |
Optical properties | Biaxial (+), 2V = 0°–65° |
Refractive index | nα=1.675–1.694, nβ=1.684–1.695, nγ=1.685–1.700 |
Birefringence | δ =0.0060–0.0080 |
References | [2][3][4] |
Triphylite is a lithium iron(II) phosphate mineral with the chemical formula LiFe2+PO4.[5] It is a member of the triphylite group, and forms a complete solid solution series with the lithium manganese(II) phosphate, lithiophilite.
References
- ^ "Chandlers Mill Quarry, Newport, Sullivan Co., New Hampshire, USA". MinDat.org.
- ^ "Triphylite". WebMineral.com. Retrieved July 15, 2015.
- ^ "Triphylite". Mindat.org.
- ^ Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (eds.). "Triphylite" (PDF). Handbook of Mineralogy. Chantilly, VA: Mineralogical Society of America.
- ^ IMA-CNMNC List of Mineral Names (May 2015), International Mineralogical Association
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