Almandine and Star Sapphire Physical Properties

Almandine

Star Sapphire

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.95-4.30

3.90-4.05

1.5 Fracture

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

Not Available

1.6 Cleavage

none

Not Available

1.7 Mohs Hardness

7-7.5

Not Available

1.8 Chemical Composition

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

Al 2O 3Ulrich Henn and Claudio C.

Almandine and Star Sapphire Chemical Formula

While comparing Almandine 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 Almandine and Star Sapphire chemical formula.

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

Compare Red Gemstones

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Almandine Vs Baryte Barite

Almandine Vs Black Opal

Almandine and Star Sapphire Specific Gravity

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