Copper Hydroxy Carbonate
Cu3(CO3)2(OH)2
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Chemical name
Copper Hydroxy Carbonate |
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Mineral name
Azurite |
|
Chemical formula
Cu3(CO3)2(OH)2 |
|
Crystal system
monoclinic |
|
Crystal Class
monoclinic-prismatic (2/m) |
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Space Group
P2_1/c |
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Unit cell
a [Å]:5.01 b [Å]:5.85 c [Å]:10.35 |
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Molecular weight [g/mol]
344,65 |
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Formula units
Z=2 |
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Twinning
rare on {-101}, {-102}, {001} |
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Mohs hardness
3.5 - 4 |
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Density [g/cm3]
3.77 |
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Cleavage
nearly perfect on {011}, distinct on {100}, indistinct on {110} |
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Fracture / Tenacity
conchoidal |
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Color
(azure-)blue, very dark to pale blue, pale blue in transmitted light |
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Streak
light blue |
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Transparency
transparent to translucent |
|
Luster
vitreous |
|
Optical character
biaxial (+) |
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Refractive Index
nα=1.730; nβ=1.758; nΥ=1.838 |
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Birefringence δ
0.108 |
|
Pleochroism δ
moderate to strong |
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Piezoelectric crystals |
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T(c) [°C]
nε = 1.568–1.602 |
