Onyx and Faustite Physical Properties

Onyx

Faustite

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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

2.55-2.702.9

1 7.18

1.5 Fracture

Not Available

Conchoidal, ConchoidalAnthony et al, Conchoidal, Brittle, Conchoidal

1.6 Cleavage

Indiscernible

{???} Indistinct

1.7 Mohs Hardness

6.5-74.5

2 10

1.8 Chemical Composition

SiO₂

(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

Onyx and Faustite Chemical Formula

While comparing Onyx and Faustite 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 Faustite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Faustite- (Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)

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Onyx and Faustite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Faustite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Faustite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 2.9 whereas that of Faustite is 2.9.