Ettringite and Hardystonite Physical Properties

Ettringite

Hardystonite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Partially soluble in water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.773.396-3.443

1 7.18

1.5 Fracture

Not Available

Brittle, Metallic

1.6 Cleavage

Perfect on {10 1 0}

[001] good, [100] and [110] fair

1.7 Mohs Hardness

2-2.53-4

2 10

1.8 Chemical Composition

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

Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)

Ettringite and Hardystonite Chemical Formula

While comparing Ettringite and Hardystonite 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 Ettringite and Hardystonite chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Hardystonite- Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)

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Ettringite and Hardystonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Hardystonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Hardystonite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 3.396-3.443 whereas that of Hardystonite is 3.396-3.443.