Ruby and Ettringite Physical Properties

Ruby

Ettringite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

3.97-4.051.77

1 7.18

1.5 Fracture

Conchoidal

Not Available

1.6 Cleavage

No true cleavage

Perfect on {10 1 0}

1.7 Mohs Hardness

92-2.5

2 10

1.8 Chemical Composition

Al ₂ O ₃

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

Ruby and Ettringite Chemical Formula

While comparing Ruby 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 Ruby and Ettringite chemical formula.

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

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Ruby and Ettringite Specific Gravity

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