Ettringite and Goethite Physical Properties

Ettringite

Goethite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Partially soluble in water

HCl soluble

1.3 Durability

Not Available

1.4 Specific Gravity

1.774.27-4.29

1 7.18

1.5 Fracture

Not Available

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

1.6 Cleavage

Perfect on {10 1 0}

Perfect {010}

1.7 Mohs Hardness

2-2.55-5.5

2 10

1.8 Chemical Composition

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

FeO(OH)Arthur Thomas , Gemstones (2009)

Ettringite and Goethite Chemical Formula

While comparing Ettringite and Goethite 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 Goethite chemical formula.

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

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Ettringite and Goethite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Goethite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Goethite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 4.27-4.29 whereas that of Goethite is 4.27-4.29.