Caledonite and Common Opal Physical Properties

Caledonite

Common Opal

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

5.6-5.76

1.98-2.50

1.5 Fracture

Uneven, UnevenAnthony et al, Handbook of mineralogy (2001)

Conchoidal, Conchoidal, Gemstones of the world (2001)

1.6 Cleavage

[001] perfect; [100] distinct

Not Available

1.7 Mohs Hardness

2.5-3

5.5-6.5

1.8 Chemical Composition

Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)

SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Caledonite and Common Opal Chemical Formula

While comparing Caledonite and Common 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 Caledonite and Common Opal chemical formula.

Chemical formula of Caledonite- Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

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Caledonite and Common Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Caledonite and Common Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Caledonite and Common Opal Optical Properties during the identification of gemstone. Specific gravity of Caledonite is 1.98-2.50 whereas that of Common Opal is 1.98-2.50.