Hercynite and Boulder Opal Physical Properties

Hercynite

Boulder Opal

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

4.39

Uneven

{111} Indistinct, {111} Indistinct, {111} Indistinct

7.5-8

Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

1.98-2.25

Conchoidal

None

5-6.5

SiO 2 + H 2OUlrich Henn and Claudio C.

Hercynite and Boulder Opal Chemical Formula

While comparing Hercynite and Boulder Opal 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 Hercynite and Boulder Opal chemical formula.

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Hercynite and Boulder Opal Specific Gravity

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