General Information:
Chemical Formula:
CaAl2Si3O10·5-6(H2O)
Composition:
(Molecular Weight = 446.38 gm)
Calcium 8.98 % Ca
Aluminum 12.09 % Al
Silicon 18.88 % Si
Hydrogen 2.71 % H
Oxygen 57.35 % O
Empirical Formula:
CaAl2Si3O10·6(H2O)
Environment:
A low-silica zeolite from hydrothermal solutions in low-silica rocks.
IMA Status:
Approved IMA 1975
Locality:
Neer Road, N of Goble, Columbia County, Oregon, USA>
Name Origin:
Named for John George Cowles (1907-1985), Ameriacan amateur mineralogist and zeolite collector.
Physical Properties:
Cleavage:
[010] Perfect
Color:
colorless, gray white, or white.
Density:
2.14
Diaphaniety:
Transparent
Habits:
Bladed - Aggregates of thin lath-like crystals (e.g. kyanite)., Stellate - Occurs as spherical, radial aggregates radiating from a "star" like point.,
Hardness:
5-5.5 - Apatite-Knife Blade
Luminescence:
Fluorescent.
Luster:
Vitreous - Greasy
Streak:
white
More details...