Calcium Aluminium Silicate (Zeolite)
(CaAl2Si3O10)*3H2O
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Chemical name
Calcium Aluminium Silicate (Zeolite) |
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Mineral name
Scolecite |
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Chemical formula
(CaAl2Si3O10)*3H2O |
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Crystal system
monoclinic |
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Crystal Class
monoclinic-domatic (m) |
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Space Group
Cc |
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Unit cell
a [Å]:18.51 b [Å]:18.97 c [Å]:6.53 |
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Molecular weight [g/mol]
514.54 |
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Formula units
Z=8 |
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Frequent crystal surfaces
{010}, {110}, {111} |
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Twinning
on [001] pseudorhomohedral contact- and penetration twinning, on {010} lamellar |
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Mohs hardness
5 - 5.5 |
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Density [g/cm3]
~2.3 |
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Cleavage
perfect on {110} and {1-10} |
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Fracture / Tenacity
uneven, brittle |
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Color
colorless to white, pink, salmon, red or green |
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Streak
white |
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Transparency
transparent to translucent |
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Luster
vitreous, silky when fibrous |
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Optical character
biaxial (-) |
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Refractive Index
nα=1.507-1.513; nβ=1.516-1.520; nΥ=1.517-1.521 |
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Birefringence δ
0.010 |
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Other
pyroelectric and piezoelectric |
