General Information:
Chemical Formula:
KLiFe++Al(AlSi3)O10(F,OH)2
Composition:
(Molecular Weight = 437.10 gm)
Potassium 8.94 % K
Lithium 1.59 % Li
Aluminum 12.35 % Al
Iron 12.78 % Fe
Silicon 19.28 % Si
Hydrogen 0.12 % H
Oxygen 38.43 % O
Fluorine 6.52 % F
Empirical Formula:
KLiFe2+Al2Si3O10F1.5(OH)0.5
Environment:
Pneumatolytic mineral occurring in cassiterite and topaz-bearing pegmatites.
Locality:
Erzgebirge of Saxony at Zinnwald (now Cinovec) - "Ore Mountains", Czechoslovakia.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[001] Good
Color:
light brown, silvery white, gray, yellowish white, or greenish white.
Density:
2.9 - 3.1, Average = 3
Diaphaniety:
Transparent
Habits:
Pseudo Hexagonal - Crystals show a hexagonal outline., Micaceous - Platy texture with "flexible" plates., Platy - Sheet forms (e.g. micas).
Hardness:
3.5-4 - Copper Penny-Flourite
Luminescence:
None.
Luster:
Vitreous - Pearly
Streak:
white
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