Goethite and Ettringite Physical Properties

Goethite

Ettringite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

HCl soluble

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

4.27-4.291.77

1 7.18

1.5 Fracture

Uneven, torn surfaces, (e.g. fractured metals)., Uneven, Gemstones (2009), torn surfaces, (e.g. fractured metals).

Not Available

1.6 Cleavage

Perfect {010}

Perfect on {10 1 0}

1.7 Mohs Hardness

5-5.52-2.5

2 10

1.8 Chemical Composition

FeO(OH)Arthur Thomas , Gemstones (2009)

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

Goethite and Ettringite Chemical Formula

While comparing Goethite 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 Goethite and Ettringite chemical formula.

Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)
Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Goethite and Ettringite Specific Gravity

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