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 Semi - Precious Stone

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Iolite

Mohs Hardness: 7-7.5
Specific Gravity:
2.57-2.66
Reflective Index:
1.53-1.54

Iolite is the gem name for cordierite, a silicate of aluminum and 
magnesium. Its name is derived from the Greek ios (violet) and 
lithos (stone).

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