Astrophyllite and Black Opal Physical Properties

Astrophyllite

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

3.2-3.4

1.97-2.22

1.5 Fracture

Uneven, Brittle, Metallic

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

1.6 Cleavage

Perfect on [001] imperfect on [100]

Not Available

1.7 Mohs Hardness

6-6.5

1.8 Chemical Composition

(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

SiO 2 + H 2OUlrich Henn and Claudio C.

Astrophyllite and Black Opal Chemical Formula

While comparing Astrophyllite 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 Astrophyllite and Black Opal chemical formula.

Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

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Astrophyllite and Black Opal Specific Gravity

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