Pyrope Almandine and Black Opal Physical Properties

Pyrope Almandine

Black Opal

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.62-4.201.97-2.22

1 7.18

1.5 Fracture

ConchoidalGemdat.org, Management Team (2012), ConchoidalGemdat.org, Management Team (2012)

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

Not Available

1.7 Mohs Hardness

7-7.56-6.5

2 10

1.8 Chemical Composition

(Fe,Mg) 3Al 2(SiO 4) 3gemdat.org , Management Team (2012)

SiO 2 + H 2OUlrich Henn and Claudio C.

Pyrope Almandine and Black Opal Chemical Formula

While comparing Pyrope Almandine and Black 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 Pyrope Almandine and Black Opal chemical formula.

Chemical formula of Pyrope Almandine- (Fe,Mg) 3Al 2(SiO 4) 3gemdat.org , Management Team (2012)
Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

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Pyrope Almandine and Black Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pyrope Almandine and Black Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pyrope Almandine and Black Opal Optical Properties during the identification of gemstone. Specific gravity of Pyrope Almandine is 1.97-2.22 whereas that of Black Opal is 1.97-2.22.