Boulder Opal and Grossular Physical Properties

Boulder Opal

Grossular

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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

1.98-2.253.55-3.73

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

Not Available

none

1.7 Mohs Hardness

5-6.57-7.5

2 10

1.8 Chemical Composition

SiO 2 + H 2OUlrich Henn and Claudio C.

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

Boulder Opal and Grossular Chemical Formula

While comparing Boulder Opal and Grossular 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 Grossular chemical formula.

Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Chemical formula of Grossular- Ca 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

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Boulder Opal Vs Chrysocolla

Boulder Opal and Grossular Specific Gravity

Another important criteria for qualitative analysis of gemstones is Boulder Opal and Grossular Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Boulder Opal and Grossular Optical Properties during the identification of gemstone. Specific gravity of Boulder Opal is 3.55-3.73 whereas that of Grossular is 3.55-3.73.