Andradite and Star Sapphire Physical Properties

Andradite

Star Sapphire

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.70-4.103.90-4.05

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

none

Not Available

1.7 Mohs Hardness

6.5-7Not Available

2 10

1.8 Chemical Composition

Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Al 2O 3Ulrich Henn and Claudio C.

Andradite and Star Sapphire Chemical Formula

While comparing Andradite and Star Sapphire 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 Andradite and Star Sapphire chemical formula.

Chemical formula of Andradite- Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Star Sapphire- Al 2O 3Ulrich Henn and Claudio C.

Compare Green Gemstones

Andradite Vs Astrophyllite

Andradite Vs Aragonite

Andradite Vs Augite

Andradite and Star Sapphire Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andradite and Star Sapphire Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andradite and Star Sapphire Optical Properties during the identification of gemstone. Specific gravity of Andradite is 3.90-4.05 whereas that of Star Sapphire is 3.90-4.05.