Common Opal and Helenite Physical Properties

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Common Opal

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Helenite

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Common Opal

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Helenite

Common Opal

Common Opal

Helenite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

-

-

-

1.98-2.50

Conchoidal

None

5.5-6.5

SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

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-

-

-9999

-

Indiscernible

-9999

SiO₂

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Common Opal

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