Pollucite and Andalusite Physical Properties

Pollucite

Andalusite

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Physical Properties

Tenacity

Brittle

Solubility

Readily soluble in HF

Durability

Specific Gravity

2.86-2.943.05-3.21

1 7.18

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Fracture

Conchoidal, Uneven

Uneven, Subconchoidal, Splintery

Cleavage

None observed

Good on {110}, poor on {100}

Mohs Hardness

6.5-77.5

2 10

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Chemical Composition

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

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Pollucite and Andalusite Chemical Formula

While comparing Pollucite and Andalusite 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 Andalusite 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 Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Compare White Gemstones

Pollucite Vs Whitlockite

Pollucite Vs Witherite

Pollucite Vs Xonotlite

Pollucite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pollucite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pollucite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Pollucite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.