Precious Opal and Andradite Physical Properties

Precious Opal

Andradite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.98-2.253.70-4.10

1 7.18

1.5 Fracture

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references

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

1.6 Cleavage

Not Available

none

1.7 Mohs Hardness

5-6.56.5-7

2 10

1.8 Chemical Composition

SiO 2 · nH 2OGemdat.org , Management Team (2012)

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

Precious Opal and Andradite Chemical Formula

While comparing Precious Opal 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 Precious Opal and Andradite chemical formula.

Chemical formula of Precious Opal- SiO 2 · nH 2OGemdat.org , Management Team (2012)
Chemical formula of Andradite- Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Compare Blue Gemstones

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Precious Opal Vs Sard

Precious Opal Vs Sardonyx

Precious Opal and Andradite Specific Gravity

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