Boulder Opal and Andradite Garnet Physical Properties

Boulder Opal

Andradite Garnet

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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

1.98-2.253.8-3.9

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

Not Available

None

1.7 Mohs Hardness

5-6.56.5-7.5

2 10

1.8 Chemical Composition

SiO 2 + H 2OUlrich Henn and Claudio C.

Ca₃Fe³⁺₂Si₃O₁₂

Boulder Opal and Andradite Garnet Chemical Formula

While comparing Boulder Opal and Andradite Garnet 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 Boulder Opal and Andradite Garnet chemical formula.

Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Chemical formula of Andradite Garnet- Ca₃Fe³⁺₂Si₃O₁₂

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Boulder Opal and Andradite Garnet Specific Gravity

Another important criteria for qualitative analysis of gemstones is Boulder Opal and Andradite Garnet Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Boulder Opal and Andradite Garnet Optical Properties during the identification of gemstone. Specific gravity of Boulder Opal is 3.8-3.9 whereas that of Andradite Garnet is 3.8-3.9.