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Aragonite
Aragonite

Boulder Opal
Boulder Opal



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Aragonite
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Boulder Opal

Aragonite and Boulder Opal Physical Properties

Physical Properties

Tenacity

Brittle
-

Solubility

Dilute acid
-

Durability

-
-

Specific Gravity

2.93-2.961.98-2.25
1 7.18
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Fracture

Subconchoidal, Conchoidal
Conchoidal

Cleavage

Distinct on {010}, imperfect {110} and {011}
None

Mohs Hardness

3.5-45-6.5
2 10
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Chemical Composition

CaCO 3Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
SiO 2 + H 2OUlrich Henn and Claudio C.

Aragonite and Boulder Opal Chemical Formula

While comparing Aragonite 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 Aragonite and Boulder Opal chemical formula.

  • Chemical formula of Aragonite- CaCO 3Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
  • Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

Aragonite and Boulder Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Aragonite and Boulder Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Aragonite and Boulder Opal Optical Properties during the identification of gemstone. Specific gravity of Aragonite is 1.98-2.25 whereas that of Boulder Opal is 1.98-2.25.