General Information:
Chemical Formula:
Ca3Al2(SO4)(F,OH)10·2(H2O)
Composition:
(Molecular Weight = 491.30 gm)
Calcium 24.47 % Ca
Aluminum 10.98 % Al
Hydrogen 1.33 % H
Sulfur 6.53 % S
Oxygen 27.68 % O
Fluorine 29.00 % F
Empirical Formula:
Ca3Al2(SO4)F7.5(OH)2.5·2(H2O)
Locality:
Wagon Wheel Gap, Creed Quadrangle, Colorado, USA.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[100] Perfect
Color:
colorless, violet, or white.
Density:
2.71
Diaphaniety:
Transparent to translucent
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Prismatic - Crystals Shaped like Slender Prisms (e.g. tourma
Hardness:
3.5 - Copper Penny
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Greasy
Streak:
white
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