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Opal
Opal

Pyrope Spessartine
Pyrope Spessartine



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Opal
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Pyrope Spessartine
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
BrittleWalter Schumann
hot salt water
-
1.98-2.25
Conchoidal
None
5-6.5
SiO2 · nH2O
 
-
-
-
3.62-4.33
Uneven
None
7-7.5
Mn 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)