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Dominant species
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Lithiophyllite
Lithiophyllite
Chemical
Formula
LiMnPO4
Species
Phosphates
Crystal
System
Orthorhombic
Mohs
Scale
4-5
Specific
Gravity
3.445-3.50
Color
Clove-brown, yellowish brown, honey-yellow, salmon-pink, blue-gray, gray
Streak
White to grayish white
Luster
Vitreous to subresinous
Refractive
Index
nα=1.669, nβ=1.673, nγ=1.682
Diaphaneity
Transparent to translucent
Cleavage
perfect, and poor
Fracture
uneven to conchoidal
Crystal Habit:Prismatic – crystals shaped like slender prisms
Lithiophilite is a mineral containing the element lithium. It is lithium manganese(II) phosphate with formula: LiMnPO4. It occurs in pegmatites often associated with triphylite, the iron end member in a solid solution series. The mineral with intermediate composition is known as sicklerite (Li(Mn,Fe)PO4). The name lithiophilite is derived from the Greek philos (φιλ??) "friend," as lithiophilite is usually found with lithium.

Lithiophylite is a resinous reddish to yellowish brown mineral crystallizing in the orthorhombic system often as slender prisms. It is usually associated with lepidolite, beryl, quartz, albite, amblygonite, and spodumene of pegmatitic origin. It rather readily weathers to a variety of secondary manganese phosphates and oxides. It is a late-stage mineral in some complex granite pegmatites. Members of the triphylite-lithiophilite series readily alter to secondary minerals.

The type locality is the Branchville Quarry, Branchville, Fairfield County, Connecticut where it was first reported in 1878. The largest documented single crystal of lithiophilite was found in New Hampshire, US, measured 2.44×1.83×1.22 m3 and weighed ~20 tonnes.

The synthetic form of triphylite, lithium iron phosphate, is a promising material for the production of lithium-ion batteries; the defect and crystal structure properties of the natural material make it unsuitable for this use.[citation needed]