Triphylite
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|
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 | [3][4][5] |
Triphylite is a lithium iron(II)
Etymology and history
The mineral was first discovered and examined in 1834 by German mineralogist Johann Nepomuk von Fuchs at Hennenkobel Mine in the Bavarian Forest.[7][8] The name derives from the Greek words tri ("three") and phulon ("family"), referring to the three cations found in natural samples of triphylite (Li+, Fe2+, Mn2+).[5]
Crystal structure
Triphylite crystallizes in an orthorhombic crystal system. The lithium coordinates to six oxygen atoms in a distorted octahedron. Likewise, the iron centers are octahedrally coordinated. The structure contains isolated phosphate tetrahedra.[9]
Properties
Triphylite is soluble in
Triphylite forms a complex solution series with lithiophilite, LiMnPO4, so that natural sources of triphylite usually contain manganese. The structures of members within this series are similar to olivine-type silicates.[10]
References
- ^ "Chandlers Mill Quarry, Newport, Sullivan Co., New Hampshire, USA". MinDat.org.
- S2CID 235729616.
- ^ "Triphylite". WebMineral.com. Retrieved July 15, 2015.
- ^ "Triphylite". Mindat.org.
- ^ a b 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
- ^ ..
- ^ ..
- ^ "Triphylin". Römpp Online. Retrieved 2020-06-13.
- ^ "Lithiophite-Triphylite Series". Mindat.org.