Pollucite and Ettringite Physical Properties

Pollucite

Ettringite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Readily soluble in HF

Partially soluble in water

1.3 Durability

Not Available

1.4 Specific Gravity

2.86-2.941.77

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

None observed

Perfect on {10 1 0}

1.7 Mohs Hardness

6.5-72-2.5

2 10

1.8 Chemical Composition

(Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references

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

Pollucite and Ettringite Chemical Formula

While comparing Pollucite 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 Pollucite and Ettringite chemical formula.

Chemical formula of Pollucite- (Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references
Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

Compare White Gemstones

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Pollucite and Ettringite Specific Gravity

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