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Optic Character


Clarity


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Grey Gemstones

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Gemstones
Dispersion
Refractive Index
Optic Character
Specific Gravity
Mohs Hardness
Talisman
Aragonite
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0.17
1.525-1.686
-
2.93-2.96
3.5-4
-
Galena
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0.16
-9999
-
6.23
2.5-2.75
-
Vanadinite
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0.15
2.416
-
6.8-7.1
3-4
-
Flint
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0.15
-9999
-
-9999
-9999
-
Falcons Eye
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0.05
1.534-1.540
-
2.58-2.64
7
-
Fancy Diamond
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0.04
2.42
-
-9999
10
-
Plumbogummite
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0.04
1.653-1.688
-
4.014
4-5
-
Hollandite
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0.03
-9999
-
5.05
4-6
-
Gaylussite
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0.03
1.444
-
1.93-1.99
2.5
-
Baryte
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0.03
1.634-1.637
-
4.3-5
3-3.5
-
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