Gibbsite and Ettringite Physical Properties

Gibbsite

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

2.351.77

1 7.18

1.5 Fracture

Fibrous, Difficult, Fibrous

Not Available

1.6 Cleavage

{001} Perfect

Perfect on {10 1 0}

1.7 Mohs Hardness

2.5-32-2.5

2 10

1.8 Chemical Composition

Al(OH)3

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

Gibbsite and Ettringite Chemical Formula

While comparing Gibbsite 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 Gibbsite and Ettringite chemical formula.

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

Compare Grey Gemstones

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Gibbsite Vs Galena

Gibbsite Vs Vanadinite

Gibbsite and Ettringite Specific Gravity

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