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Dallasite
Dallasite
☒

Black Opal
Black Opal
☒



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Dallasite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.58-2.91
-
-
6.5-7
-
 
-
-
-
1.97-2.22
Conchoidal
None
6-6.5
SiO 2 + H 2OUlrich Henn and Claudio C.

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Black Opal Vs Dioptase
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Black Opal Vs Ekanite

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