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Ettringite
Ettringite

Goethite
Goethite



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Ettringite
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Ettringite and Goethite Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Partially soluble in water
HCl soluble
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.77
4.27-4.29
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
2-2.5
5-5.5
1.8 Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , 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 O’Donoghue , Gems, Sixth Edition (2006)
  • Chemical formula of Goethite- FeO(OH)Arthur Thomas , Gemstones (2009)

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.