Phlogopite and Topaz Physical Properties

Phlogopite

Topaz

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1 Physical Properties

1.1 Tenacity

Tough

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.78-2.853.49-3.57

1 7.18

1.5 Fracture

None, Uneven

Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

Perfect basal (001)

[001] Perfect

1.7 Mohs Hardness

2-2.58

2 10

1.8 Chemical Composition

Not Available

Al₂SiO₄(F,OH)₂

Phlogopite and Topaz Chemical Formula

While comparing Phlogopite and Topaz 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 Phlogopite and Topaz chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂

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Phlogopite and Topaz Specific Gravity

Another important criteria for qualitative analysis of gemstones is Phlogopite and Topaz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Phlogopite and Topaz Optical Properties during the identification of gemstone. Specific gravity of Phlogopite is 3.49-3.57 whereas that of Topaz is 3.49-3.57.