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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]
Category Phosphate minerals
(repeating unit)
Strunz classification 8.AB.10
Crystal system Orthorhombic
Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space group Pmnb
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.


  1. ^ "Chandlers Mill Quarry, Newport, Sullivan Co., New Hampshire, USA". 
  2. ^ "Triphylite". Retrieved July 15, 2015. 
  3. ^ "Triphylite". 
  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