Pollucite and Gibbsite Physical Properties

Pollucite

Gibbsite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Readily soluble in HF

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.86-2.94

2.35

1.5 Fracture

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

Fibrous, Difficult, Fibrous

1.6 Cleavage

None observed

{001} Perfect

1.7 Mohs Hardness

6.5-7

2.5-3

1.8 Chemical Composition

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

Al(OH)3

Pollucite and Gibbsite Chemical Formula

While comparing Pollucite and Gibbsite 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 Gibbsite 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 Gibbsite- Al(OH)3

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Pollucite and Gibbsite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pollucite and Gibbsite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pollucite and Gibbsite Optical Properties during the identification of gemstone. Specific gravity of Pollucite is 2.35 whereas that of Gibbsite is 2.35.