Triphylite

Formula: LiFePO4

Origin of name: from Greek for three and family

 

Crystal system: orthorhombic

Crystal class: 2/m 2/m 2/m

Twinning:

Unit cell: a = 6.019 Å, b = 11.35 Å, c = 4.704 Å

 

Colour: greenish gray, bluish gray, surface alters brownish to blackish

Diaphaneity: 

Luster: resinous to vitreous

Habit: crystals stout prismatic, rare, faces often rounded or rough, massive, cleavable

Hardness: 4 to 5

Specific gravity: 3.42

Cleavage: 3; {100} nearly perfect, {010} imperfect, {011} interrupted

Tenacity: subconchoidal to uneven

Streak: colourless to dirty white

 

Synonyms/varieties:

 

Comments: series with lithiophilite

 

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