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Precious Opal
Precious Opal

Gahnospinel
Gahnospinel



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Precious Opal
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Gahnospinel
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
1.98-2.25
Conchoidal
None
5-6.5
SiO 2 · nH 2OGemdat.org , Management Team (2012)
 
-
-
-
3.65-4.55
Conchoidal
None, but may exhibit slight parting
7.5-8
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)