Apatite and Prehnite Physical Properties

Apatite

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

3.16-3.232.80-2.95

1 7.18

1.5 Fracture

Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal to uneven

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

1.6 Cleavage

[0001] indistinct, [1010] indistinct

Distinct on [001]

1.7 Mohs Hardness

56-6.5

2 10

1.8 Chemical Composition

Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references

Ca₂Al₂Si₃O₁₂(OH)

Apatite and Prehnite Chemical Formula

While comparing Apatite 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 Apatite and Prehnite chemical formula.

Chemical formula of Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references
Chemical formula of Prehnite- Ca₂Al₂Si₃O₁₂(OH)

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Apatite and Prehnite Specific Gravity

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