Jacobsite and Alexandrite Physical Properties

Jacobsite

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

4.76-5.03

3.69-3.81

1.5 Fracture

Conchoidal, Brittle

Not Available

1.6 Cleavage

None

1,1 ; 3,2.

1.7 Mohs Hardness

5.5-6.5

8.5

1.8 Chemical Composition

(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)

BeAl ₂ O ₄

Jacobsite and Alexandrite Chemical Formula

While comparing Jacobsite 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 Jacobsite and Alexandrite chemical formula.

Chemical formula of Jacobsite- (Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Jacobsite and Alexandrite Specific Gravity

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