Ettringite and Scolecite Physical Properties

Ettringite

Scolecite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Partially soluble in water

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

1.772.20-2.23

1 7.18

1.5 Fracture

Not Available

Irregular/uneven, UnevenAnthony et al, Handbook of mineralogy (2001), Brittle, Uneven

1.6 Cleavage

Perfect on {10 1 0}

Perfect on {110} and {1 1 0}

1.7 Mohs Hardness

2-2.55-5.5

2 10

1.8 Chemical Composition

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

CaAl 2Si 3O 10 · 3H 2OUlrich Henn and Claudio C.

Ettringite and Scolecite Chemical Formula

While comparing Ettringite and Scolecite 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 Scolecite chemical formula.

Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Scolecite- CaAl 2Si 3O 10 · 3H 2OUlrich Henn and Claudio C.

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Ettringite and Scolecite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Scolecite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Scolecite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.20-2.23 whereas that of Scolecite is 2.20-2.23.