Zoisite and Steatite Physical Properties

Zoisite

Steatite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.20-3.502.20-2.80

1 7.18

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Fracture

Uneven, Conchoidal, Even

Cleavage

Perfect {010} imperfect {100}

Perfect

Mohs Hardness

6-7-9999

2 10

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Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

Mg 3Si 4O 10(OH) 2Gemdat.org , Management Team (2012)

Zoisite and Steatite Chemical Formula

While comparing Zoisite and Steatite 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 Steatite chemical formula.

Chemical formula of Zoisite- Ca₂Al₃(SiO₄)₃(OH)
Chemical formula of Steatite- Mg 3Si 4O 10(OH) 2Gemdat.org , Management Team (2012)

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Zoisite and Steatite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Zoisite and Steatite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Zoisite and Steatite Optical Properties during the identification of gemstone. Specific gravity of Zoisite is 2.20-2.80 whereas that of Steatite is 2.20-2.80.