Andalusite and Prehnite Physical Properties

Andalusite

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

3.05-3.21

2.80-2.95

1.5 Fracture

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

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

1.6 Cleavage

Good on {110}, poor on {100}

Distinct on [001]

1.7 Mohs Hardness

7.5

6-6.5

1.8 Chemical Composition

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Ca₂Al₂Si₃O₁₂(OH)

Andalusite and Prehnite Chemical Formula

While comparing Andalusite 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 Andalusite and Prehnite chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Prehnite- Ca₂Al₂Si₃O₁₂(OH)

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Andalusite and Prehnite Specific Gravity

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