Topaz and Pollucite Physical Properties

Topaz

Pollucite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Readily soluble in HF

1.3 Durability

Not Available

1.4 Specific Gravity

3.49-3.572.86-2.94

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

[001] Perfect

None observed

1.7 Mohs Hardness

86.5-7

2 10

1.8 Chemical Composition

Al₂SiO₄(F,OH)₂

(Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references

Topaz and Pollucite Chemical Formula

While comparing Topaz and Pollucite 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 Topaz and Pollucite chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂
Chemical formula of Pollucite- (Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references

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Topaz and Pollucite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Topaz and Pollucite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Pollucite Optical Properties during the identification of gemstone. Specific gravity of Topaz is 2.86-2.94 whereas that of Pollucite is 2.86-2.94.