Triphylite

Triphylite crystal in matrix, collected from Smith Quarry (Chandler Mills Quarry), Newport, New Hampshire 43°21′28″N 72°15′8″W / 43.35778°N 72.25222°W / 43.35778; -72.25222[1]
General
Category Phosphate minerals
Formula
(repeating unit)
LiFe2+PO4
Strunz classification 8.AB.10
Crystal system Orthorhombic
Identification
Color Green–blue gray, brown–black
Crystal habit Massive, granular, prismatic
Crystal symmetry Orthorhombic - dipyramidal
H-M symbol: (2/m 2/m 2/m)
Space group: Pmnb
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

  1. "Chandlers Mill Quarry, Newport, Sullivan Co., New Hampshire, USA". MinDat.org.
  2. "Triphylite". WebMineral.com. Retrieved July 15, 2015.
  3. "Triphylite". Mindat.org.
  4. Anthony, John W.; Bideaux, Richard A.; Bladh, Kenneth W.; Nichols, Monte C. (eds.). "Triphylite" (PDF). Handbook of Mineralogy. Chantilly, VA: Mineralogical Society of America.
  5. IMA-CNMNC List of Mineral Names (May 2015), International Mineralogical Association
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