Ettringite and Erythrite Physical Properties

Ettringite

Erythrite

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1 Physical Properties

1.1 Tenacity

Not Available

Sectile

1.2 Solubility

Partially soluble in water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.773.06

1 7.18

1.5 Fracture

Not Available

Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

1.6 Cleavage

Perfect on {10 1 0}

Perfect on {010}; poor on {100} and { 1 02}.

1.7 Mohs Hardness

2-2.5Not Available

2 10

1.8 Chemical Composition

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

Co3(AsO4)2•8(H2O)

Ettringite and Erythrite Chemical Formula

While comparing Ettringite and Erythrite 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 Erythrite chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)

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Ettringite and Erythrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Erythrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Erythrite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 3.06 whereas that of Erythrite is 3.06.