Boulder Opal and Prehnite Physical Properties

Boulder Opal

Prehnite

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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

1.98-2.252.80-2.95

1 7.18

1.5 Fracture

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

Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic

1.6 Cleavage

Not Available

Distinct on [001]

1.7 Mohs Hardness

5-6.56-6.5

2 10

1.8 Chemical Composition

SiO 2 + H 2OUlrich Henn and Claudio C.

Ca₂Al₂Si₃O₁₂(OH)

Boulder Opal and Prehnite Chemical Formula

While comparing Boulder Opal and Prehnite 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 Prehnite chemical formula.

Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Chemical formula of Prehnite- Ca₂Al₂Si₃O₁₂(OH)

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Boulder Opal and Prehnite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Boulder Opal and Prehnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Boulder Opal and Prehnite Optical Properties during the identification of gemstone. Specific gravity of Boulder Opal is 2.80-2.95 whereas that of Prehnite is 2.80-2.95.