Biotite and Alexandrite Physical Properties

Biotite

Alexandrite

Add ⊕

1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.7-3.33.69-3.81

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

Not Available

1.6 Cleavage

Perfect on the {001}

1,1 ; 3,2.

1.7 Mohs Hardness

2.5-3.08.5

2 10

1.8 Chemical Composition

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

BeAl ₂ O ₄

Biotite and Alexandrite Chemical Formula

While comparing Biotite and Alexandrite 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 Alexandrite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Alexandrite- BeAl ₂ O ₄

Compare Yellow Gemstones

Biotite Vs Hauyne

Biotite Vs Gyrolite

Biotite Vs Hanksite

Biotite and Alexandrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Alexandrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Alexandrite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 3.69-3.81 whereas that of Alexandrite is 3.69-3.81.