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Optic Character


Clarity


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Red Gemstones

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Gemstones
Dispersion
Refractive Index
Optic Character
Specific Gravity
Mohs Hardness
Talisman
Andesine
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0.70
1.543-1.564
Biaxial/+
2.65-2.69
6-6.5
-
Brookite
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0.20
2.583-2.741
-
3.87-4.14
5.5-6
-
Franklinite
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0.19
-9999
-
5.05-5.22
5.5-6
-
Aragonite
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0.17
1.525-1.686
-
2.93-2.96
3.5-4
-
Astrophyllite
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0.12
1.678-1.758
-
3.2-3.4
3
-
Cassiterite
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0.07
1.990-2.105
-
6.86-7.03
6-7
-
Andradite
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0.06
1.88-1.94
-
3.70-4.10
6.5-7
-
Cinnabar
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0.06
2.905-3.25
-
2
2-2.5
-
Realgar
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0.06
2.538-2.704
-
3.56
-9999
-
Cuprite
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0.05
2.849
-
5.85-6.15
3.5-4
-
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