Achroite and Variscite Physical Properties

Achroite

Variscite

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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

2.90-3.40

2.42-2.58

1.5 Fracture

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

Conchoidal, Splintery, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle

1.6 Cleavage

Not Available

[010] perfect

1.7 Mohs Hardness

7-7.5

4-5

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.

AlPO₄ · 2(H₂O)

Achroite and Variscite Chemical Formula

While comparing Achroite and Variscite 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 Variscite 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 Variscite- AlPO₄ · 2(H₂O)

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Achroite and Variscite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Achroite and Variscite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Variscite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 2.42-2.58 whereas that of Variscite is 2.42-2.58.