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Demantoid
Demantoid

Iolite
Iolite



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Demantoid
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Iolite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.77-3.95
-
Imperfect
6.5
Ca 3Fe 2(SiO 4) 3Ulrich Henn and Claudio C.
 
-
-
-
2.6-2.7
-
3,1
7-7.5
Mg2Al4Si5O18