Biotite and Tourmaline Physical Properties

Biotite

Tourmaline

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.7-3.32.85-3.35

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

Perfect on the {001}

Indistinct

1.7 Mohs Hardness

2.5-3.07-7.5

2 10

1.8 Chemical Composition

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

Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.

Biotite and Tourmaline Chemical Formula

While comparing Biotite and Tourmaline 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 Tourmaline chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Tourmaline- Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.

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Biotite and Tourmaline Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Tourmaline Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Tourmaline Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.85-3.35 whereas that of Tourmaline is 2.85-3.35.