Alexandrite and Rock Crystal Physical Properties

Alexandrite

Rock Crystal

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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

3.69-3.812.65

1 7.18

1.5 Fracture

Not Available

ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

1,1 ; 3,2.

Not Available

1.7 Mohs Hardness

8.57

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

SiO 2Walter Schumann , Gemstones of the world (2001)

Alexandrite and Rock Crystal Chemical Formula

While comparing Alexandrite and Rock Crystal 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 Alexandrite and Rock Crystal chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Rock Crystal- SiO 2Walter Schumann , Gemstones of the world (2001)

Compare Gems for Scorpio

Alexandrite Vs Gahnospinel

Alexandrite Vs Fluorite

Alexandrite Vs Citrine

Alexandrite and Rock Crystal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Rock Crystal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Rock Crystal Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 2.65 whereas that of Rock Crystal is 2.65.