Topaz and Wood Opal Physical Properties

Topaz

Wood Opal

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.49-3.571.98-2.50

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

[001] Perfect

Not Available

1.7 Mohs Hardness

85.5-6.5

2 10

1.8 Chemical Composition

Al₂SiO₄(F,OH)₂

SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Topaz and Wood Opal Chemical Formula

While comparing Topaz and Wood 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 Topaz and Wood Opal chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂
Chemical formula of Wood Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

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Topaz and Wood Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Topaz and Wood Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Wood Opal Optical Properties during the identification of gemstone. Specific gravity of Topaz is 1.98-2.50 whereas that of Wood Opal is 1.98-2.50.