Grossular and Ettringite Physical Properties

Grossular

Ettringite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

3.55-3.731.77

1 7.18

1.5 Fracture

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

Not Available

1.6 Cleavage

none

Perfect on {10 1 0}

1.7 Mohs Hardness

7-7.52-2.5

2 10

1.8 Chemical Composition

Ca 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

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

Grossular and Ettringite Chemical Formula

While comparing Grossular 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 Grossular and Ettringite chemical formula.

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

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Grossular and Ettringite Specific Gravity

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