Ettringite and Gibbsite Physical Properties

Ettringite

Gibbsite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Partially soluble in water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.772.35

1 7.18

1.5 Fracture

Not Available

Fibrous, Difficult, Fibrous

1.6 Cleavage

Perfect on {10 1 0}

{001} Perfect

1.7 Mohs Hardness

2-2.52.5-3

2 10

1.8 Chemical Composition

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

Al(OH)3

Ettringite and Gibbsite Chemical Formula

While comparing Ettringite and Gibbsite 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 Gibbsite chemical formula.

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

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Ettringite and Gibbsite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Gibbsite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Gibbsite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.35 whereas that of Gibbsite is 2.35.