Onyx and Pollucite Physical Properties

Onyx

Pollucite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

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

Not Available

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

1.6 Cleavage

Indiscernible

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

Onyx and Pollucite Chemical Formula

While comparing Onyx 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 Onyx and Pollucite chemical formula.

Chemical formula of Onyx- 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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Onyx and Pollucite Specific Gravity

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