Oligoclase and Petalite Physical Properties

Oligoclase

Petalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.62-2.672.40

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

From the Greek, oligos and kasein, little cleavage.

Perfect on {001}, poor on {201} with 38.5° angle between the two

1.7 Mohs Hardness

6-6.56-6.5

2 10

1.8 Chemical Composition

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

LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Oligoclase and Petalite Chemical Formula

While comparing Oligoclase and Petalite 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 Petalite 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 Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Compare Colorless Gems

Oligoclase Vs Phosphophyllite

Oligoclase Vs Phenakite

Oligoclase Vs Pezzottaite

Oligoclase and Petalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Oligoclase and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Oligoclase and Petalite Optical Properties during the identification of gemstone. Specific gravity of Oligoclase is 2.40 whereas that of Petalite is 2.40.