Formula: LiAl(PO4)(OH,F)
Origin of name: After locality; Montebras, Creuse, France
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell: a = 5.178 Å, b = 7.123 Å, c = 5.053 Å, α = 112.0°, β = 97.9°, γ = 67.8°
Colour: White to grayish white, colourless, yellowish, pinkish, tan, greenish
Diaphaneity:
Luster: Vitreous to greasy, pearly on cleavage
Habit: Crystals equant to short prismatic; massive, cleavable
Hardness: 5.5 to 6
Specific gravity: 3.027
Cleavage: 4; {100} perfect, {110} good, {0-11} distinct, {001} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with amblygonite
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