Kyanite and Ettringite Physical Properties

Kyanite

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

3.53-3.651.77

1 7.18

1.5 Fracture

Splintery, Brittle, Metallic

Not Available

1.6 Cleavage

[100] perfect [010] imperfect with 79° angle between

Perfect on {10 1 0}

1.7 Mohs Hardness

4-72-2.5

2 10

1.8 Chemical Composition

Not Available

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

Kyanite and Ettringite Chemical Formula

While comparing Kyanite 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 Kyanite and Ettringite chemical formula.

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

Compare Blue Gemstones

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Kyanite Vs Swiss blue topaz

Kyanite Vs Blue quartz

Kyanite and Ettringite Specific Gravity

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