Apophyllite and Rock Crystal Physical Properties

Apophyllite

Rock Crystal

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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

2.30-2.502.65

1 7.18

1.5 Fracture

Uneven, UnevenArthur Thomas, Gemstones (2009)

ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

Perfect on (001)

Not Available

1.7 Mohs Hardness

4.5-57

2 10

1.8 Chemical Composition

KCa 4Si 8O 20(F,OH) · 8H 2OUlrich Henn and Claudio C.

SiO 2Walter Schumann , Gemstones of the world (2001)

Apophyllite and Rock Crystal Chemical Formula

While comparing Apophyllite and Rock Crystal 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 Apophyllite and Rock Crystal chemical formula.

Chemical formula of Apophyllite- KCa 4Si 8O 20(F,OH) · 8H 2OUlrich Henn and Claudio C.
Chemical formula of Rock Crystal- SiO 2Walter Schumann , Gemstones of the world (2001)

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Apophyllite and Rock Crystal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Apophyllite and Rock Crystal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Apophyllite and Rock Crystal Optical Properties during the identification of gemstone. Specific gravity of Apophyllite is 2.65 whereas that of Rock Crystal is 2.65.