General Information:
Chemical Formula:Ca3[Si6O15]·6(H2O)
Composition:(Molecular Weight = 1,966.57 gm)Calcium 20.38 %
CaSilicon 25.71 %
SiHydrogen 1.85 %
H Oxygen 52.07 %
O Empirical Formula: Ca10Si18O46·18(H2O)
Environment:Secondary mineral from the alteration of basalts.
Locality:Disko Island, Greenland. Poona, near Bombay, India.
Name Origin:Named after the German natural historian, Lorenz Oken (1779-1851), Munich Germany.
Physical Properties: Cleavage:[001] Good
Color:white, yellowish white, or bluish white.
Density:2.3 - 2.33, Average = 2.31
Diaphaniety:Transparent to Translucent
Habits:Capillary - Very slender and long, like a thread or hair (e.g. millerite)., Spherical - Spherical, rounded aggregates., Fibrous - Crystals made up of fibers.
Hardness:5 - Apatite
Luminescence:Fluorescent.
Luster:Pearly
Streak:white
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