×

Common Opal
Common Opal
☒

Chalcopyrite
Chalcopyrite
☒



ADD ⊕
Compare
X
Common Opal
X
Chalcopyrite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
1.98-2.50
Conchoidal
None
5.5-6.5
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
 
Brittle
Soluble
-
4.1-4.3
Uneven
Indistinct on {011}
3.5-4
CuFeS 2Anthony et al , Handbook of mineralogy (2001)