Rubellite and Polyhalite Physical Properties

Rubellite

Polyhalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.01-3.062.78

1 7.18

1.5 Fracture

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

Conchoidal, Brittle

1.6 Cleavage

Not Available

Perfect on {10 1 }; parting on {010}

1.7 Mohs Hardness

7-7.53.5

2 10

1.8 Chemical Composition

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

Not Available

Rubellite and Polyhalite Chemical Formula

While comparing Rubellite and Polyhalite 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 Rubellite and Polyhalite chemical formula.

Chemical formula of Rubellite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

Compare Blue Gemstones

Rubellite Vs Shattuckite

Rubellite Vs Scorzalite

Rubellite Vs Serendibite

Rubellite and Polyhalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Rubellite and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Rubellite and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Rubellite is 2.78 whereas that of Polyhalite is 2.78.