Biotite and Boulder Opal Physical Properties

Biotite

Boulder Opal

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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

2.7-3.31.98-2.25

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

Perfect on the {001}

Not Available

1.7 Mohs Hardness

2.5-3.05-6.5

2 10

1.8 Chemical Composition

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

SiO 2 + H 2OUlrich Henn and Claudio C.

Biotite and Boulder Opal Chemical Formula

While comparing Biotite and Boulder Opal 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 Boulder Opal chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

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Biotite and Boulder Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Boulder Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Boulder Opal Optical Properties during the identification of gemstone. Specific gravity of Biotite is 1.98-2.25 whereas that of Boulder Opal is 1.98-2.25.