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Optic Character
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Biaxial/+
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TransparentArthur Thomas
TransparentUlrich Henn and Claudio C. Milisenda
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Gems Found in America
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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
-
Astrophyllite
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0.12
1.678-1.758
-
3.2-3.4
3
-
Cobaltite
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0.07
-9999
-
6.3
5.5
-
Villiaumite
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0.05
1.328-1.332
-
2.79
2
-
Nano Polycrystalline Diamond
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0.04
-9999
-
3.52
-9999
-
Diamond
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0.04
2.417-2.419
-
3.50-3.53
10
Leo
Carletonite
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0.04
1.517-1.521
-
2.45
4-4.5
-
Hessonite
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0.03
1.742-1.748
-
3.55-3.73
7-7.5
-
Romanchite
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0.03
-9999
-
4.70-4.74
5-6
-
Cancrinite
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0.03
1.491-1.524
-
2.42-2.52
5-6
-
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