Rossmanite and Topaz Physical Properties

Rossmanite

Topaz

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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

33.49-3.57

1 7.18

1.5 Fracture

Brittle, Metallic

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

1.6 Cleavage

None

[001] Perfect

1.7 Mohs Hardness

Not Available8

2 10

1.8 Chemical Composition

◻(LiAl 2)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

Al₂SiO₄(F,OH)₂

Rossmanite and Topaz Chemical Formula

While comparing Rossmanite 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 Rossmanite and Topaz chemical formula.

Chemical formula of Rossmanite- ◻(LiAl 2)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Chemical formula of Topaz- Al₂SiO₄(F,OH)₂

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Rossmanite and Topaz Specific Gravity

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