Oligoclase and Opal Physical Properties

Oligoclase

Opal

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1 Physical Properties

1.1 Tenacity

Not Available

BrittleWalter Schumann

1.2 Solubility

Not Available

hot salt water

1.3 Durability

Not Available

1.4 Specific Gravity

2.62-2.671.98-2.25

1 7.18

1.5 Fracture

Gems, Sixth Edition (2006), Gems, Sixth Edition (2006), Uneven

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle

1.6 Cleavage

From the Greek, oligos and kasein, little cleavage.

None

1.7 Mohs Hardness

6-6.55-6.5

2 10

1.8 Chemical Composition

Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

SiO₂ · nH₂O

Oligoclase and Opal Chemical Formula

While comparing Oligoclase and 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 Oligoclase and Opal chemical formula.

Chemical formula of Oligoclase- Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Opal- SiO₂ · nH₂O

Compare Colorless Gems

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Oligoclase and Opal Specific Gravity

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