Achroite and Apophyllite Physical Properties

Achroite

Apophyllite

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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

2.90-3.402.30-2.50

1 7.18

1.5 Fracture

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

Uneven, UnevenArthur Thomas, Gemstones (2009)

1.6 Cleavage

Not Available

Perfect on (001)

1.7 Mohs Hardness

7-7.54.5-5

2 10

1.8 Chemical Composition

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

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

Achroite and Apophyllite Chemical Formula

While comparing Achroite and Apophyllite 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 Achroite and Apophyllite chemical formula.

Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.
Chemical formula of Apophyllite- KCa 4Si 8O 20(F,OH) · 8H 2OUlrich Henn and Claudio C.

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Achroite and Apophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Achroite and Apophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Apophyllite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 2.30-2.50 whereas that of Apophyllite is 2.30-2.50.