Biotite and Aragonite Physical Properties

Biotite

Aragonite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

Dilute acid

1.3 Durability

Not Available

1.4 Specific Gravity

2.7-3.32.93-2.96

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

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

1.6 Cleavage

Perfect on the {001}

Distinct on {010}, imperfect {110} and {011}

1.7 Mohs Hardness

2.5-3.03.5-4

2 10

1.8 Chemical Composition

K(Mg,Fe++)3[AlSi3O10(OH,F)2

CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Biotite and Aragonite Chemical Formula

While comparing Biotite and Aragonite 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 Biotite and Aragonite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Aragonite- CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Biotite and Aragonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Aragonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Aragonite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.93-2.96 whereas that of Aragonite is 2.93-2.96.