Pollucite and Chalcedony Physical Properties

Pollucite

Chalcedony

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Readily soluble in HF

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.86-2.942.55-2.70

1 7.18

1.5 Fracture

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

Uneven, Splintery, Conchoidal, Uneven, Splintery, Conchoidal, UnevenWalter Schumann

1.6 Cleavage

None observed

Absent

1.7 Mohs Hardness

6.5-76.5-7

2 10

1.8 Chemical Composition

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

SiO₂

Pollucite and Chalcedony Chemical Formula

While comparing Pollucite and Chalcedony 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 Chalcedony 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 Chalcedony- SiO₂

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Pollucite and Chalcedony Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pollucite and Chalcedony Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pollucite and Chalcedony Optical Properties during the identification of gemstone. Specific gravity of Pollucite is 2.55-2.70 whereas that of Chalcedony is 2.55-2.70.