Dravite and Prehnite Physical Properties

Dravite

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

3.03-3.182.80-2.95

1 7.18

1.5 Fracture

Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

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

1.6 Cleavage

{???} Indistinct

Distinct on [001]

1.7 Mohs Hardness

7-7.56-6.5

2 10

1.8 Chemical Composition

Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

Ca₂Al₂Si₃O₁₂(OH)

Dravite and Prehnite Chemical Formula

While comparing Dravite 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 Dravite and Prehnite chemical formula.

Chemical formula of Dravite- Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Chemical formula of Prehnite- Ca₂Al₂Si₃O₁₂(OH)

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Dravite and Prehnite Specific Gravity

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