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Gems Found in USA
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Optic Character


Clarity


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48 Gemstones Found
Gemstones
Dispersion
Specific Gravity
Mohs Hardness
Refractive Index
Optic Character
Talisman
Sinhalite
Sinhalite
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0.02
3.46-3.50
6-7
1.665-1.712
Not Available
Not Available
Sillimanite
Sillimanite
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Not Available
3.20-3.26
6-7.5
1.653-1.685
Not Available
Not Available
Serpentine
Serpentine
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None
2.44-2.62
2.5-5.5
1.560-1.571
Not Available
Not Available
Sapphire
Sapphire
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0.02
3.95-4.03
9
1.762-1.788
Not Available
Not Available
Phosphosiderite
Phosphosiderite
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Not Available
2.74-2.76
3.5-4
1.692-1.739
Not Available
Not Available
Phenakite
Phenakite
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0.02
2.90-2.98
7.5-8
1.650-1.695
Not Available
Not Available
Petalite
Petalite
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0.01
2.40
6-6.5
1.502-1.523
Not Available
Not Available
Norbergite
Norbergite
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Not Available
3.177
6-6.5
1.563-1.593
Not Available
Not Available
Neptunite
Neptunite
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Not Available
3.19-3.23
5-6
1.692-1.734
Not Available
Not Available
Moss Opal
Moss Opal
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Not Available
1.98-2.50
5.5-6.5
1.37-1.52
Not Available
Not Available
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