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Dominant species
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Heulandite
Chemical
Formula
(Ca,Na)2-3Al3(Al,Si)2Si13O36·12H2O
Species
Silicates
Mohs
Scale
3
Specific
Gravity
2.17
Color
White
Streak
White
Luster
Vitreous, Pearly
Refractive
Index
n = 1.476 - 1.506 n = 1.479 - 1.510 n = 1.479 - 1.517
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