Rubellite and Amethyst Physical Properties

Rubellite

Amethyst

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

insoluble in common solvents

1.3 Durability

Not Available

1.4 Specific Gravity

3.01-3.06

2.65

1.5 Fracture

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

Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

Not Available

Indiscernible

1.7 Mohs Hardness

7-7.5

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.

SiO₂

Rubellite and Amethyst Chemical Formula

While comparing Rubellite and Amethyst 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 Amethyst 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.
Chemical formula of Amethyst- SiO₂

Compare Blue Gemstones

Rubellite Vs Scorzalite

Rubellite Vs Shattuckite

Rubellite Vs Serendibite

Rubellite and Amethyst Specific Gravity

Another important criteria for qualitative analysis of gemstones is Rubellite and Amethyst Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Rubellite and Amethyst Optical Properties during the identification of gemstone. Specific gravity of Rubellite is 2.65 whereas that of Amethyst is 2.65.