Onyx and Feldspar Physical Properties

Onyx

Feldspar

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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

2.55-2.702.56-2.75

1 7.18

1.5 Fracture

Not Available

Uneven, Conchoidal, Uneven, Conchoidal, Gemstones of the world (2001)

1.6 Cleavage

Indiscernible

two or three

1.7 Mohs Hardness

6.5-76-6.5

2 10

1.8 Chemical Composition

SiO₂

Not Available

Onyx and Feldspar Chemical Formula

While comparing Onyx and Feldspar 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 Feldspar chemical formula.

Chemical formula of Onyx- SiO₂

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Onyx and Feldspar Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Feldspar Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Feldspar Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.56-2.75 whereas that of Feldspar is 2.56-2.75.