Topaz and Ettringite Physical Properties

Topaz

Ettringite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

3.49-3.571.77

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

[001] Perfect

Perfect on {10 1 0}

1.7 Mohs Hardness

82-2.5

2 10

1.8 Chemical Composition

Al₂SiO₄(F,OH)₂

Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

Topaz and Ettringite Chemical Formula

While comparing Topaz and Ettringite 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 Ettringite chemical formula.

Chemical formula of Topaz- Al₂SiO₄(F,OH)₂
Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Topaz and Ettringite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Topaz and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Topaz is 1.77 whereas that of Ettringite is 1.77.