Chalcedony and Pollucite Physical Properties

Chalcedony

Pollucite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Soluble

Readily soluble in HF

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.702.86-2.94

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

Absent

None observed

1.7 Mohs Hardness

6.5-76.5-7

2 10

1.8 Chemical Composition

SiO₂

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

Chalcedony and Pollucite Chemical Formula

While comparing Chalcedony and Pollucite 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 Chalcedony and Pollucite chemical formula.

Chemical formula of Chalcedony- SiO₂
Chemical formula of Pollucite- (Cs,Na)(AlSi 2O 6) · 0.5H 2OWalter Schumann , Gemstones of the world (2001) More from other references

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Chalcedony and Pollucite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Chalcedony and Pollucite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Chalcedony and Pollucite Optical Properties during the identification of gemstone. Specific gravity of Chalcedony is 2.86-2.94 whereas that of Pollucite is 2.86-2.94.