Achroite and Prehnite Physical Properties

Achroite

Prehnite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.90-3.40

2.80-2.95

1.5 Fracture

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

Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic

1.6 Cleavage

Not Available

Distinct on [001]

1.7 Mohs Hardness

7-7.5

6-6.5

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.

Ca₂Al₂Si₃O₁₂(OH)

Achroite and Prehnite Chemical Formula

While comparing Achroite and Prehnite 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 Prehnite 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 Prehnite- Ca₂Al₂Si₃O₁₂(OH)

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Achroite and Prehnite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Achroite and Prehnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Prehnite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 2.80-2.95 whereas that of Prehnite is 2.80-2.95.