Biotite and Ruby Physical Properties

Biotite

Ruby

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.7-3.33.97-4.05

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

Conchoidal

1.6 Cleavage

Perfect on the {001}

No true cleavage

1.7 Mohs Hardness

2.5-3.09

2 10

1.8 Chemical Composition

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

Al ₂ O ₃

Biotite and Ruby Chemical Formula

While comparing Biotite and Ruby 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 Ruby chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Ruby- Al ₂ O ₃

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Biotite and Ruby Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Ruby Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Ruby Optical Properties during the identification of gemstone. Specific gravity of Biotite is 3.97-4.05 whereas that of Ruby is 3.97-4.05.