Biotite and Achroite Physical Properties

Biotite

Achroite

Add ⊕

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

Brittle

2.7-3.3

Uneven, Even

Perfect on the {001}

2.5-3.0

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

2.90-3.40

Uneven, ConchoidalWalter Schumann

Indiscernible

7-7.5

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

Biotite and Achroite Chemical Formula

While comparing Biotite and Achroite 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 Achroite chemical formula.

Compare Yellow Gemstones

Biotite Vs Weloganite

Biotite Vs Pyrite Marcasite

Biotite Vs Druzy

Biotite and Achroite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite Vs Achroite during the identification of gemstone. Specific gravity of Biotite is whereas that of Achroite is .