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Optic Character


Clarity


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Gems Found In Africa

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Gemstones
Dispersion
Refractive Index
Optic Character
Specific Gravity
Mohs Hardness
Talisman
Calcite Satin Spar
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0.17
1.486-1.658
-
2.67-2.73
-9999
-
Azurmalachite
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0.07
1.655-1.909
Biaxial/+
3.70-3.95
3.5-4
-
Hbnerite
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0.05
2.17-2.32
-
7.12-7.18
4-4.5
-
Clinohedrite
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0.03
1
-
3.28-3.335
5.5
-
Chlorapatite
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0.03
1.665-1.667
-
3.17-3.18
-9999
-
Poldervaartite
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0.03
1.634-1.656
-
2.91
-9999
-
Thaumasite
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0.03
1.467-1.505
-
1.91
3.5
-
Transvaal Jade
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0.03
-9999
-
3.55-3.73
7-7.5
-
Umbalite
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0.02
1.730-1.820
-
3.62-4.33
7-7.5
-
Chrysocolla
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0.02
1.460-1.570
-
2.00-2.45
2-4
-
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