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Mexican fire opal
Mexican fire opal
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Mexican fire opal
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.355-3.433
Uneven
{???} Good, {???} Good
-9999
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)
 
-
-
-
-9999
-
None
-9999
SiO2·nH2O