Calcium Phosphate
Ca5(PO4)3(F,Cl,OH)
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Chemical name
Calcium Phosphate |
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Mineral name
Apatite |
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Chemical formula
Ca5(PO4)3(F,Cl,OH) |
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Melting point [°C]
1670 |
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Crystal system
hexagonal |
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Crystal Class
hexagonal-dipyramidal (6/m) |
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Space Group
P6_3/m |
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Unit cell
a [Å]:9.38 b [Å]:9.38 c [Å]:6.86 |
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Molecular weight [g/mol]
689,67 |
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Formula units
Z=2 |
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Frequent crystal surfaces
{10-10}, {0001}, {10-11} |
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Mohs hardness
5 |
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Density [g/cm3]
3.2 |
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Cleavage
indistinct |
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Fracture / Tenacity
brittle to conchoidal |
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Color
usually green, colorless, yellow, blue, violet, pink, brown |
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Streak
white |
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Transparency
transparent to translucent |
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Luster
vitreous to subresinous |
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Optical character
uniaxial (-) |
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Refractive Index
nω=1.631-1.675; nε=1.627-1.668 |
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Birefringence δ
0.004 - 0.014 |
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Pleochroism δ
weak to very weak |
