Ettringite and Spinel Physical Properties

Ettringite

Spinel

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Partially soluble in water

none

1.3 Durability

Not Available

1.4 Specific Gravity

1.773.64-3.66

1 7.18

1.5 Fracture

Not Available

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

Perfect on {10 1 0}

None, but may exhibit slight parting

1.7 Mohs Hardness

2-2.58

2 10

1.8 Chemical Composition

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

MgAl₂O₄

Ettringite and Spinel Chemical Formula

While comparing Ettringite and Spinel 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 Spinel chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Spinel- MgAl₂O₄

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Ettringite and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.