General Information:
Chemical Formula:
(K,Na)Ca4Si8O20(F,OH)·8(H2O)
IMA Status:
Approved IMA
Name Origin:
From the Greek apophylliso - "it flakes off."
Physical Properties:
Cleavage:
[001] Perfect
Color:
white, pink, green, yellow, or violet.
Density:
2.3 - 2.4, Average = 2.34
Diaphaniety:
Transparent to Translucent
Habits:
Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Pseudo Cubic - Crystals show a cubic outline., Massive - Uniformly indistinguishable crystals forming large masses .
Hardness:
4-5 - Fluorite-Apatite
Luminescence:
None.
Luster:
Vitreous - Pearly
Streak:
white
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