Caledonite and Alexandrite Physical Properties

Caledonite

Alexandrite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

5.6-5.763.69-3.81

1 7.18

1.5 Fracture

Uneven, UnevenAnthony et al, Handbook of mineralogy (2001)

Not Available

1.6 Cleavage

[001] perfect; [100] distinct

1,1 ; 3,2.

1.7 Mohs Hardness

2.5-38.5

2 10

1.8 Chemical Composition

Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)

BeAl ₂ O ₄

Caledonite and Alexandrite Chemical Formula

While comparing Caledonite 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 Caledonite and Alexandrite chemical formula.

Chemical formula of Caledonite- Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Caledonite and Alexandrite Specific Gravity

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