General Information:
Chemical Formula:
(Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O)
Composition:
(Molecular Weight = 1,278.30 gm)
Calcium 3.14 % Ca
Aluminum 6.33 % Al
Silicon 28.56 % Si
Hydrogen 1.89 % H
Oxygen 60.08 % O
Empirical Formula:
CaAl3Si13O36·12(H2O)
Environment:
Low temperature zeolite found in a wide variety of geologic environments: volcanic rocks, metamorphic rocks, pegmatites, tuffs, and deep-sea sediments.
IMA Status:
Approved IMA
Locality:
Glasgow, Strathclyde (Dumbartonshire), Scotland.
Name Origin:
Named after the English mineral collector, John Henry Heuland (1778-1856), a British mineral collector and dealer.
Physical Properties:
Cleavage:
[010] Perfect
Color:
white, reddish white, grayish white, brownish white, or yellow.
Density:
2.2
Diaphaniety:
Transparent to subtranslucent
Habits:
Tabular - Form dimensions are thin in one direction., Crystalline - Coarse - Occurs as well-formed coarse sized crystals.,
Hardness:
3-3.5 - Calcite-Copper Penny
Luminescence:
None.
Luster:
Vitreous - Pearly
Streak:
white
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