Biotite and Sunstone Physical Properties

Biotite

Sunstone

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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

2.7-3.32.62-2.65

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

Gemstones of the world (2001)

1.6 Cleavage

Perfect on the {001}

001

1.7 Mohs Hardness

2.5-3.06

2 10

1.8 Chemical Composition

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

Microcline: KAlSi₃O₈ Oligoclase: (Na,Ca)Al_1-2Si_3-2O₈

Biotite and Sunstone Chemical Formula

While comparing Biotite and Sunstone 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 Sunstone chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Sunstone- Microcline: KAlSi₃O₈ Oligoclase: (Na,Ca)Al_1-2Si_3-2O₈

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Biotite and Sunstone Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Sunstone Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Sunstone Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.62-2.65 whereas that of Sunstone is 2.62-2.65.