Hardystonite and Andradite Physical Properties

Hardystonite

Andradite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.396-3.4433.70-4.10

1 7.18

1.5 Fracture

Brittle, Metallic

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

1.6 Cleavage

[001] good, [100] and [110] fair

none

1.7 Mohs Hardness

3-46.5-7

2 10

1.8 Chemical Composition

Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)

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

Hardystonite and Andradite Chemical Formula

While comparing Hardystonite and Andradite 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 Hardystonite and Andradite chemical formula.

Chemical formula of Hardystonite- Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Andradite- Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

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Hardystonite and Andradite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Hardystonite and Andradite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hardystonite and Andradite Optical Properties during the identification of gemstone. Specific gravity of Hardystonite is 3.70-4.10 whereas that of Andradite is 3.70-4.10.