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Gems Found in USA
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Gemstones
Dispersion
Refractive Index
Optic Character
Specific Gravity
Mohs Hardness
Talisman
Franklinite
Franklinite
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0.19
-9999
-
5.05-5.22
5.5-6
-
Ulexite
Ulexite
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0.06
1.491-1.520
-
1.65-1.99
2-2.5
-
Caledonite
Caledonite
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0.05
1.818-1.909
-
5.6-5.76
2.5-3
-
Benitoite
Benitoite
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0.04
1.757-1.804
-
3.61-3.68
6-6.5
-
Friedelite
Friedelite
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0.04
1.627-1.663
-
3.06-3.19
4-5
-
Hardystonite
Hardystonite
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0.03
1.672
-
3.396-3.443
3-4
-
Almandine
Almandine
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0.03
1.770-1.820
-
3.95-4.30
7-7.5
-
Axinite
Axinite
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0.02
1.656-1.704
Biaxial/+
3.26-3.36
6.5-7
-
Danburite
Danburite
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0.02
1.627-1.639
Biaxial/+
2.97-3.03
7
-
Cordierite Iolite
Cordierite Iolite
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0.02
1.542-1.578
Biaxial/+
2.56-2.66
7-7.5
-
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List of All Gemstones » More

Strontium Titanate
Strontium Titanate
Hbnerite
Hbnerite
Nano Polycrystalline Diamond
Nano Polycrystalline Diamond

Gemstone Comparison » More

Strontium Titanate
Hbnerite
Strontium Titanate Vs Hbnerite
Nano Polycrystalline Diamond
Romanchite
Nano Polycrystalline Diamon...
Rutilated topaz
Rosinca
Rutilated topaz Vs Rosinca

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