Calcium Magnesium Carbonate
CaMg(CO3)2
|
Chemical name
Calcium Magnesium Carbonate |
|
Mineral name
Dolomite |
|
Chemical formula
CaMg(CO3)2 |
|
Melting point [°C]
N/A |
|
Crystal system
trigonal |
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Crystal Class
trigonal-rhombohedral (-3) |
|
Space Group
R-3 |
|
Unit cell
a [Å]:4.8012(1) b [Å]:4.8012(1) c [Å]:16.002 |
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Molecular weight [g/mol]
184.399 |
|
Formula units
Z=3 |
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Frequent crystal surfaces
surfaces often saddle-shaped curved |
|
Twinning
common as simple contact twins |
|
Mohs hardness
3.5 - 4 |
|
Density [g/cm3]
2.87 |
|
Cleavage
perfect on {10-11}, rhombohedral cleavage |
|
Fracture / Tenacity
conchoidal |
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Color
white, gray to pink |
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Streak
white |
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Transparency
transparent to translucent |
|
Luster
vitreous to pearly |
|
Optical character
uniaxial (-) |
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Refractive Index
nω=1.678-1.681; nε=1.500 |
|
Birefringence δ
0.179-0.181 |
|
Pleochroism δ
none |
