Zoisite and Pyromorphite Physical Properties

Zoisite

Pyromorphite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.20-3.506.5-7.1

1 7.18

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Fracture

Uneven, Conchoidal, Even

Uneven, Conchoidal

Cleavage

Perfect {010} imperfect {100}

Imperfect- [10 1 1]

Mohs Hardness

6-73.5-4

2 10

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Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

Pb 5(PO 4) 3ClArthur Thomas , Gemstones (2009)

Zoisite and Pyromorphite Chemical Formula

While comparing Zoisite and Pyromorphite 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 Pyromorphite chemical formula.

Chemical formula of Zoisite- Ca₂Al₃(SiO₄)₃(OH)
Chemical formula of Pyromorphite- Pb 5(PO 4) 3ClArthur Thomas , Gemstones (2009)

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Zoisite and Pyromorphite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Zoisite and Pyromorphite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Zoisite and Pyromorphite Optical Properties during the identification of gemstone. Specific gravity of Zoisite is 6.5-7.1 whereas that of Pyromorphite is 6.5-7.1.