Pollucite and Kyanite Physical Properties

Pollucite

Kyanite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Readily soluble in HF

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.86-2.94

3.53-3.65

1.5 Fracture

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

Splintery, Brittle, Metallic

1.6 Cleavage

None observed

[100] perfect [010] imperfect with 79° angle between

1.7 Mohs Hardness

6.5-7

4-7

1.8 Chemical Composition

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

Not Available

Pollucite and Kyanite Chemical Formula

While comparing Pollucite and Kyanite 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 Kyanite chemical formula.

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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Pollucite and Kyanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pollucite and Kyanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pollucite and Kyanite Optical Properties during the identification of gemstone. Specific gravity of Pollucite is 3.53-3.65 whereas that of Kyanite is 3.53-3.65.