Humite and Alexandrite Physical Properties

Humite

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

3.20-3.32

3.69-3.81

1.5 Fracture

Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal

Not Available

1.6 Cleavage

Poor

1,1 ; 3,2.

1.7 Mohs Hardness

6-6.5

8.5

1.8 Chemical Composition

(Mg,Fe2+ ) 7(SiO 4) 3(F,OH) 2Anthony et al , Handbook of mineralogy (2001)

BeAl ₂ O ₄

Humite and Alexandrite Chemical Formula

While comparing Humite 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 Humite and Alexandrite chemical formula.

Chemical formula of Humite- (Mg,Fe2+ ) 7(SiO 4) 3(F,OH) 2Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Humite and Alexandrite Specific Gravity

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