General Information:
Chemical Formula:
(Li,Na)Al(PO4)(F,OH)
Composition:
(Molecular Weight = 151.41 gm)
Sodium 3.80 % Na
Lithium 3.44 % Li
Aluminum 17.82 % Al
Phosphorus 20.46 % P
Hydrogen 0.17 % H
Oxygen 44.91 % O
Fluorine 9.41 % F
Empirical Formula:
Li0.75Na0.25Al(PO4)F0.75(OH)0.25
Name Origin:
From the Greek amblys - "blunt" and goni - "angle."
Physical Properties:
Cleavage:
[100] Perfect, [110] Good, [011] Distinct
Color:
white, yellow, gray, bluish gray, or greenish gray.
Density:
2.98 - 3.11, Average = 3.04
Diaphaniety:
Transparent to Subtransparent to translucent
Habits:
Columnar - Forms columns, Euhedral Crystals - Occurs as well-formed crystals showing good external form., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luminescence:
None.
Luster:
Vitreous - Pearly
Streak:
white
More details...