Spinel and Ettringite Physical Properties

Spinel

Ettringite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

none

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

3.64-3.661.77

1 7.18

1.5 Fracture

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

Not Available

1.6 Cleavage

None, but may exhibit slight parting

Perfect on {10 1 0}

1.7 Mohs Hardness

82-2.5

2 10

1.8 Chemical Composition

MgAl₂O₄

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

Spinel and Ettringite Chemical Formula

While comparing Spinel 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 Spinel and Ettringite chemical formula.

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

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Spinel and Ettringite Specific Gravity

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