Calcium Carbonate Aragonite type
CaCO3 (Aragonite)
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Chemical name
Calcium Carbonate Aragonite type |
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Mineral name
Aragonite |
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Chemical formula
CaCO3 (Aragonite) |
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Melting point [°C]
Varies by solvent |
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Crystal system
orthorhombic |
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Crystal Class
orthorhombic-dipyramidal (2/m 2/m 2/m) |
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Space Group
Pmcn |
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Unit cell
a [Å]:4.96 b [Å]:7.97 c [Å]:5.74 |
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Molecular weight [g/mol]
100.09 |
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Formula units
Z=4 |
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Twinning
often on {110} cyclically and polysynthetic parallel to {100} |
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Mohs hardness
3.5 - 4 |
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Density [g/cm3]
2.94 |
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Cleavage
imperfect on {110} and {011}, indistinct on {010} |
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Fracture / Tenacity
brittle, conchoidal |
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Color
white, red, yellow, orange, green, purple, gray, blue, brown |
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Streak
white |
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Transparency
translucent to transparent |
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Luster
vitreous, resinous on fracture and cleavage surfaces |
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Optical character
biaxial (-) |
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Refractive Index
nα=1.529-1.530; nβ=1.680-1.682; nΥ=1.685-1.686 |
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Birefringence δ
0.156 |
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Pleochroism δ
none |
