Opal and Cobaltite Physical Properties

Opal

Cobaltite

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1 Physical Properties

1.1 Tenacity

BrittleWalter Schumann

Not Available

1.2 Solubility

hot salt water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.98-2.256.3

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle

UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, UnevenAnthony et al, Handbook of mineralogy (2001) More from other references, Brittle, Metallic

1.6 Cleavage

None

{100} Good, {010} Good, {001} Good

1.7 Mohs Hardness

5-6.55.5

2 10

1.8 Chemical Composition

SiO₂ · nH₂O

CoAsSAnthony et al , Handbook of mineralogy (2001)

Opal and Cobaltite Chemical Formula

While comparing Opal and Cobaltite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Opal and Cobaltite chemical formula.

Chemical formula of Opal- SiO₂ · nH₂O
Chemical formula of Cobaltite- CoAsSAnthony et al , Handbook of mineralogy (2001)

Compare Semi Precious Gemstones

Opal Vs Lehsunia

Opal Vs Amethyst

Opal Vs Alexandrite

Opal and Cobaltite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Opal and Cobaltite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Opal and Cobaltite Optical Properties during the identification of gemstone. Specific gravity of Opal is 6.3 whereas that of Cobaltite is 6.3.