Mineral Information and Data:

Lithiophilite
LiMn2+PO4 [CNMNC approved formula]

Named from its lithium composition and the Greek for friend.

IMA status : Valid species (Pre-IMA 1878) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
38.01.01.02  
  (38) Anhydrous Phosphates, etc
  (38.01) A+ B++ XO4
  (38.01.01) Triphylite Group
  
Nickel-Strunz
(10th edition) :
08.AB.10
  (08) Phosphates, Arsenates, Vanadates
  (08.A) Phosphates, etc. without additional anions, without H2O
  (08.AB) With medium-sized cations
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 6.05 Å, b = 10.32 Å, c = 4.71 Å
Crystal Habit: Crystals anhedral to subhedral, large, with rough faces; massive, cleavable
Twinning: Rare contact twins on {130}
  
Color: Light reddish brown, yellowish brown, salmon
Diaphaneity: Transparent, Translucent
Luster: Vitreous to subresinous
Hardness (Mohs): 4 to 5
Measured Density: 3.34 g/cm3
Cleavage: 3; {100} nearly perfect, {010} imperfect, {011} interrupted
Tenacity: Brittle
Fracture: Uneven to sub-conchoidal
Streak: White to grayish white
  
Polymorphism and Series: Forms a series with triphylite.
Geologic Setting: A late-stage mineral in some complex granite pegmatites; usually primary but rarely secondary.
Mineral Association: Sicklerite, purpurite, huréaulite, numerous Fe–Mn phosphates and oxides
  
Synonyms/varieties: Lithiolite, Lithio-Mangano-Triphylite
Comments: Soluble in acids.

 

Lithiophilite
Lithiophilite twin
Origin: Foote mine, Kings Mountain, Cleveland Co., North Carolina, U.S.A.
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Lithiophilite
Lithiophilite and fluorapatite
Origin: Foote mine, Kings Mountain, Cleveland Co., North Carolina, U.S.A.
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Lithiophilite
Crude white or clear crystals in vugs
with light pink rhodochrosite and fluorapatite.
Origin: Foote mine, Cleveland Co., North Carolina, United States
Sample size: 9 x 5 x 4 cm
Photo: Tom Loomis

 

Lithiophilite
(zoom-in of above)

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