General Information:
Chemical Formula:
KCa4(Si4O10)2F·8(H2O)
Composition:
(Molecular Weight = 907.20 gm)
Potassium 4.31 % K
Calcium 17.67 % Ca
Silicon 24.77 % Si
Hydrogen 1.78 % H
Oxygen 49.38 % O
Fluorine 2.09 % F
Empirical Formula:
KCa4(Si4O10)2F·8(H2O)
Environment:
Secondary mineral in basalts.
IMA Status:
Not IMA Approved
Locality:
Lonault and Poona, southeast of Bombay, India.
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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