Onyx and Astrophyllite Physical Properties

Onyx

Astrophyllite

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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

2.55-2.703.2-3.4

1 7.18

1.5 Fracture

Not Available

Uneven, Brittle, Metallic

1.6 Cleavage

Indiscernible

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

6.5-73

2 10

1.8 Chemical Composition

SiO₂

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

Onyx and Astrophyllite Chemical Formula

While comparing Onyx and Astrophyllite 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 Onyx and Astrophyllite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

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Onyx and Astrophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.