Polyhalite and Rubellite Physical Properties

Polyhalite

Rubellite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.783.01-3.06

1 7.18

1.5 Fracture

Conchoidal, Brittle

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

1.6 Cleavage

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

Not Available

1.7 Mohs Hardness

3.57-7.5

2 10

1.8 Chemical Composition

Not Available

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.

Polyhalite and Rubellite Chemical Formula

While comparing Polyhalite and Rubellite 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 Polyhalite and Rubellite 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 Red Gemstones

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Polyhalite and Rubellite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Rubellite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Rubellite Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 3.01-3.06 whereas that of Rubellite is 3.01-3.06.