Boulder Opal and Sillimanite Physical Properties

Boulder Opal

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.98-2.253.20-3.26

1 7.18

1.5 Fracture

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

Splintery

1.6 Cleavage

Not Available

{010} perfect

1.7 Mohs Hardness

5-6.56-7.5

2 10

1.8 Chemical Composition

SiO 2 + H 2OUlrich Henn and Claudio C.

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Boulder Opal and Sillimanite Chemical Formula

While comparing Boulder Opal and Sillimanite 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 Sillimanite chemical formula.

Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Compare Blue Gemstones

Boulder Opal Vs Chrysocolla

Boulder Opal Vs Chrome-Chalcedony

Boulder Opal Vs Chrome Tourmaline

Boulder Opal and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Boulder Opal and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Boulder Opal and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Boulder Opal is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.