Pollucite and Opal Physical Properties

Pollucite

Opal

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1 Physical Properties

1.1 Tenacity

Brittle

BrittleWalter Schumann

1.2 Solubility

Readily soluble in HF

hot salt water

1.3 Durability

Not Available

1.4 Specific Gravity

2.86-2.941.98-2.25

1 7.18

1.5 Fracture

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

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle

1.6 Cleavage

None observed

None

1.7 Mohs Hardness

6.5-75-6.5

2 10

1.8 Chemical Composition

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

SiO₂ · nH₂O

Pollucite and Opal Chemical Formula

While comparing Pollucite and Opal 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 Opal 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 Opal- SiO₂ · nH₂O

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Pollucite and Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pollucite and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pollucite and Opal Optical Properties during the identification of gemstone. Specific gravity of Pollucite is 1.98-2.25 whereas that of Opal is 1.98-2.25.