Fire Agate and Alexandrite Physical Properties

Fire Agate

Alexandrite

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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

2.60-2.64

3.69-3.81

1.5 Fracture

Uneven, Splintery, Conchoidal, Uneven, Splintery, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)

Not Available

1.6 Cleavage

Absent

1,1 ; 3,2.

1.7 Mohs Hardness

6.5-7

8.5

1.8 Chemical Composition

SiO 2Arthur Thomas , Gemstones (2009)

BeAl ₂ O ₄

Fire Agate and Alexandrite Chemical Formula

While comparing Fire Agate 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 Fire Agate and Alexandrite chemical formula.

Chemical formula of Fire Agate- SiO 2Arthur Thomas , Gemstones (2009)
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Fire Agate and Alexandrite Specific Gravity

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