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Gemstones
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Optic Character
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Biaxial/+
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TransparentUlrich Henn and Claudio C. Milisenda
TransparentWalter Schumann
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Gemstones
Dispersion
Refractive Index
Optic Character
Specific Gravity
Mohs Hardness
Talisman
Anatase
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0.21
2.488-2.562
-
3.82-3.97
5.5-6
-
Brookite
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0.20
2.583-2.741
-
3.87-4.14
5.5-6
-
Magnetite
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0.20
2.42
-
5.2
5.5-6.5
-
Kutnohorite
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0.18
1.727
-
3.12
3-4
-
Aragonite
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0.17
1.525-1.686
-
2.93-2.96
3.5-4
-
Calcite
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0.15
1.486-1.658
-
2.67-2.73
3
-
Astrophyllite
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0.12
1.678-1.758
-
3.2-3.4
3
-
Andradite
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0.06
1.88-1.94
-
3.70-4.10
6.5-7
-
Cerussite
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0.06
1.803-2.078
-
6.46-6.57
3-3.5
-
Goethite
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0.05
2.26-2.398
-
4.27-4.29
5-5.5
-
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List of All Gemstones
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