Almandine and Prehnite Physical Properties

Almandine

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

3.95-4.30

2.80-2.95

1.5 Fracture

Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal

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

1.6 Cleavage

none

Distinct on [001]

1.7 Mohs Hardness

7-7.5

6-6.5

1.8 Chemical Composition

Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Ca₂Al₂Si₃O₁₂(OH)

Almandine and Prehnite Chemical Formula

While comparing Almandine 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 Almandine and Prehnite chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Prehnite- Ca₂Al₂Si₃O₁₂(OH)

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Almandine and Prehnite Specific Gravity

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