Zoisite and Common Opal Physical Properties

Zoisite

Common Opal

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.501.98-2.50

1 7.18

1.5 Fracture

Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Even

Conchoidal, Conchoidal, Gemstones of the world (2001)

1.6 Cleavage

Perfect {010} imperfect {100}

Not Available

1.7 Mohs Hardness

6-75.5-6.5

2 10

1.8 Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

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

Zoisite and Common Opal Chemical Formula

While comparing Zoisite 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 Zoisite and Common Opal chemical formula.

Chemical formula of Zoisite- Ca₂Al₃(SiO₄)₃(OH)
Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

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Zoisite Vs Sphene

Zoisite and Common Opal Specific Gravity

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