Boulder Opal and Poldervaartite Physical Properties

Boulder Opal

Poldervaartite

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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

1.98-2.252.91

1 7.18

1.5 Fracture

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

Handbook of mineralogy (2001)

1.6 Cleavage

Not Available

None

1.7 Mohs Hardness

5-6.5Not Available

2 10

1.8 Chemical Composition

SiO 2 + H 2OUlrich Henn and Claudio C.

(Ca,Mn2+ ) 2(SiO 3OH)(OH)Anthony et al , Handbook of Mineralogy (2001)

Boulder Opal and Poldervaartite Chemical Formula

While comparing Boulder Opal and Poldervaartite 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 Poldervaartite chemical formula.

Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Chemical formula of Poldervaartite- (Ca,Mn2+ ) 2(SiO 3OH)(OH)Anthony et al , Handbook of Mineralogy (2001)

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Boulder Opal and Poldervaartite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Boulder Opal and Poldervaartite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Boulder Opal and Poldervaartite Optical Properties during the identification of gemstone. Specific gravity of Boulder Opal is 2.91 whereas that of Poldervaartite is 2.91.