Black Opal and Creedite Physical Properties

Black Opal

Creedite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.97-2.222.70

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

Not Available

Perfect on {100}

1.7 Mohs Hardness

6-6.54.5

2 10

1.8 Chemical Composition

SiO 2 + H 2OUlrich Henn and Claudio C.

Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.

Black Opal and Creedite Chemical Formula

While comparing Black Opal and Creedite 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 Black Opal and Creedite chemical formula.

Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Chemical formula of Creedite- Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.

Compare Blue Gemstones

Black Opal Vs Boulder Opal

Black Opal Vs Caledonite

Black Opal Vs Brucite

Black Opal and Creedite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Black Opal and Creedite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Creedite Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 2.70 whereas that of Creedite is 2.70.