Foitite and Alexandrite Physical Properties

Foitite

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

3.173.69-3.81

1 7.18

1.5 Fracture

Handbook of mineralogy (2001)

Not Available

1.6 Cleavage

None

1,1 ; 3,2.

1.7 Mohs Hardness

78.5

2 10

1.8 Chemical Composition

Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)

BeAl ₂ O ₄

Foitite and Alexandrite Chemical Formula

While comparing Foitite 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 Foitite and Alexandrite chemical formula.

Chemical formula of Foitite- Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Foitite and Alexandrite Specific Gravity

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