Crocoite and Opal Physical Properties

Crocoite

Opal

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1 Physical Properties

1.1 Tenacity

Not Available

BrittleWalter Schumann

1.2 Solubility

Not Available

hot salt water

1.3 Durability

Not Available

1.4 Specific Gravity

5.90-6.10

1.98-2.25

1.5 Fracture

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), (e.g. graphite).

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

1.6 Cleavage

{110} Distinct, {001} Indistinct, {100} Indistinct

None

1.7 Mohs Hardness

2.5-3

5-6.5

1.8 Chemical Composition

PbCrO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

SiO₂ · nH₂O

Crocoite and Opal Chemical Formula

While comparing Crocoite and Opal 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 Crocoite and Opal chemical formula.

Chemical formula of Crocoite- PbCrO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Opal- SiO₂ · nH₂O

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Crocoite and Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Crocoite and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Crocoite and Opal Optical Properties during the identification of gemstone. Specific gravity of Crocoite is 1.98-2.25 whereas that of Opal is 1.98-2.25.