Almandine and Opal Physical Properties

Almandine

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

3.95-4.30

1.98-2.25

1.5 Fracture

Conchoidal, Brittle, Conchoidal, Brittle, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal

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

1.6 Cleavage

none

None

1.7 Mohs Hardness

7-7.5

5-6.5

1.8 Chemical Composition

Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

SiO₂ · nH₂O

Almandine and Opal Chemical Formula

While comparing Almandine 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 Almandine and Opal chemical formula.

Chemical formula of Almandine- Fe 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Chemical formula of Opal- SiO₂ · nH₂O

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Almandine and Opal Specific Gravity

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