Black Opal and Lazurite Physical Properties

Black Opal

Lazurite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

1.97-2.222.75

1 7.18

1.5 Fracture

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

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

1.6 Cleavage

Not Available

Imperfect on {110}

1.7 Mohs Hardness

6-6.55.5

2 10

1.8 Chemical Composition

SiO 2 + H 2OUlrich Henn and Claudio C.

(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

Black Opal and Lazurite Chemical Formula

While comparing Black Opal and Lazurite 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 Lazurite chemical formula.

Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.

Compare Blue Gemstones

Black Opal Vs Brucite

Black Opal Vs Caledonite

Black Opal Vs Boulder Opal

Black Opal and Lazurite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Black Opal and Lazurite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Lazurite Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 2.75 whereas that of Lazurite is 2.75.