Sylvite and Achroite Physical Properties

Sylvite

Achroite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.9932.90-3.40

1 7.18

1.5 Fracture

Uneven, Brittle

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

1.6 Cleavage

Perfect on [100], [010], [001]

Not Available

1.7 Mohs Hardness

2.57-7.5

2 10

1.8 Chemical Composition

Not Available

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.

Sylvite and Achroite Chemical Formula

While comparing Sylvite and Achroite 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 Sylvite and Achroite 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.

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Sylvite and Achroite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sylvite and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sylvite and Achroite Optical Properties during the identification of gemstone. Specific gravity of Sylvite is 2.90-3.40 whereas that of Achroite is 2.90-3.40.