Jade and Alexandrite Physical Properties

Jade

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

2.90-3.383.69-3.81

1 7.18

1.5 Fracture

Gemstones of the world (2001), Difficult, Splintery

Not Available

1.6 Cleavage

1 or 2,2 prismatic.

1,1 ; 3,2.

1.7 Mohs Hardness

6-78.5

2 10

1.8 Chemical Composition

Nephrite: Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂ Jadeite: NaAlSi₂O₆

BeAl ₂ O ₄

Jade and Alexandrite Chemical Formula

While comparing Jade 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 Jade and Alexandrite chemical formula.

Chemical formula of Jade- Nephrite: Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂ Jadeite: NaAlSi₂O₆
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Jade and Alexandrite Specific Gravity

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