Polyhalite and Ettringite Physical Properties

Polyhalite

Ettringite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

2.781.77

1 7.18

1.5 Fracture

Conchoidal, Brittle

Not Available

1.6 Cleavage

Perfect on {10 1 }; parting on {010}

Perfect on {10 1 0}

1.7 Mohs Hardness

3.52-2.5

2 10

1.8 Chemical Composition

Not Available

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

Polyhalite and Ettringite Chemical Formula

While comparing Polyhalite 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 Polyhalite and Ettringite chemical formula.

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

Compare Red Gemstones

Polyhalite Vs Jacinth

Polyhalite Vs Vanadinite

Polyhalite Vs Heliotrope

Polyhalite and Ettringite Specific Gravity

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