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| SAPPHIRE |
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Size from 0.20
mm to 20.00 mm |
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Al203 |
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Hexagonale rhomboedrique |
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Density 3,99 - 3,98 |
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Fusion Temperature 2050°C
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Thermal expansion 5,4 x 10-6/°C
face perp. axe C |
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6,2 x 10-6/°C face paral.
axe C |
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Hardness Mohs 9 |
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Hardness Knoop 1800 face perp.
axe C |
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2200 face paral. axe C |
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1,769 face paral. axe C |
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Dispersion factor 0.011 |
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