Clinozoisite
Ca2Al3(Si2O7)(SiO4)O(OH)
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Chemical name
Clinozoisite |
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Chemical formula
Ca2Al3(Si2O7)(SiO4)O(OH) |
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Crystal system
monoclinic |
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Crystal Class
monoclinic-prismatic (2/m) |
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Space Group
P2_1/m |
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Unit cell
a [Å]:8.88 b [Å]:5.58 c [Å]:10.16 |
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Molecular weight [g/mol]
454.36 |
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Formula units
Z=2 |
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Frequent crystal surfaces
{100}, {111}, {001} |
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Twinning
lamellar on {100}, rare |
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Mohs hardness
6.5 - 7 |
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Density [g/cm3]
3.2 - 3.4 |
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Cleavage
perfect on {001} |
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Fracture / Tenacity
uneven |
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Color
colorless, gray, green, light yellowish |
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Streak
grayish, white |
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Transparency
transparent to translucent |
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Luster
vitreous |
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Optical character
biaxial (+) |
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Refractive Index
nα=1.670-1.718; nβ=1.670-1.725; nΥ=1.690-1.734 |
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Birefringence δ
0.004 - 0.015 |
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Pleochroism δ
if containing small quantities of Fe(3+) moderate |
