Ettringite and Shigaite Physical Properties

Ettringite

Shigaite

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1 Physical Properties

1.1 Tenacity

Not Available

Moderately ﬂexible

1.2 Solubility

Partially soluble in water

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.772.32

1 7.18

1.5 Fracture

Not Available

Flexible Flexible fragments.

1.6 Cleavage

Perfect on {10 1 0}

Perfect on {0001}

1.7 Mohs Hardness

2-2.52

2 10

1.8 Chemical Composition

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

Not Available

Ettringite and Shigaite Chemical Formula

While comparing Ettringite and Shigaite 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 Shigaite chemical formula.

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

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Ettringite and Shigaite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Shigaite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Shigaite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.32 whereas that of Shigaite is 2.32.