Formula: (Li,Na)Al(PO4)(F,OH)
Origin of name: From Greek amblys and goni for blunt and angle
Crystal system: Triclinic
Crystal class: -1
Twinning: Common on {-1-11}; on {110}; rare on {111}
Unit cell: a = 5.15 Å, b = 7.22 Å, c = 5.06 Å, a = 114.0°, b = 98.6°, g = 67.3°
Colour: White to grayish white, also colourless, pink, tan, greenish, bluish
Diaphaneity: Transparent to translucent
Luster: Vitreous to greasy, pearly on cleavage
Habit: Crystals equant to short prismatic; usually large cleavable masses
Hardness: 5.5 to 6
Specific gravity: 3.08
Cleavage: 4; {100} perfect, {110} good, {0-11} distinct, {001} imperfect
Streak: White
Synonyms/varieties:
Comments: Series with montebrasite
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