General Information:
Chemical Formula:CaAl(OH,F)5·(H2O)
Composition:(Molecular Weight = 178.08 gm)Calcium 22.51 %
CaAluminum 15.15 %
AlHydrogen 1.70 %
H Oxygen 17.97 %
O Fluorine 42.67 %
F Empirical Formula: CaAl(OH)F4·(H2O)
Environment:Alteration product of cryolite.
IMA Status:Approved IMA 1959
Locality:Greenland and Ural Mountains, Russia.
Name Origin:Named from the Greek "Ge", for earth because it is usually earthy and arksutite, from the locality near Arksut fjord.
Physical Properties: Cleavage:None
Color:white.
Density:2.75
Diaphaniety:Transparent to subtranslucent
Habits:Acicular - Occurs as needle-like crystals., Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).,
Hardness:2 - Gypsum
Luminescence:Non-fluorescent.
Luster:Vitreous - Dull
Streak:white
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