Onyx and Alexandrite Physical Properties

Onyx

Alexandrite

Add ⊕

1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.55-2.703.69-3.81

1 7.18

1.5 Fracture

Not Available

1.6 Cleavage

Indiscernible

1,1 ; 3,2.

1.7 Mohs Hardness

6.5-78.5

2 10

1.8 Chemical Composition

SiO₂

BeAl ₂ O ₄

Onyx and Alexandrite Chemical Formula

While comparing Onyx and Alexandrite 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 Alexandrite chemical formula.

Chemical formula of Onyx- SiO₂
Chemical formula of Alexandrite- BeAl ₂ O ₄

Compare Gems for Capricorn » More

Onyx Vs Hawks Eye

Onyx Vs Crystal Quartz

Onyx Vs Quartz Smoky

» More

More Compare Gems for Capricorn

Onyx and Alexandrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Alexandrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Alexandrite Optical Properties during the identification of gemstone. Specific gravity of Onyx is 3.69-3.81 whereas that of Alexandrite is 3.69-3.81.