Chrome-Chalcedony and Alexandrite Physical Properties

Chrome-Chalcedony

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

2.55-2.703.69-3.81

1 7.18

1.5 Fracture

Not Available

1.6 Cleavage

Not Available

1,1 ; 3,2.

1.7 Mohs Hardness

6.5-78.5

2 10

1.8 Chemical Composition

SiO 2 (with trace Cr minerals) Gemdat.org , Management Team (2012)

BeAl ₂ O ₄

Chrome-Chalcedony and Alexandrite Chemical Formula

While comparing Chrome-Chalcedony 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 Chrome-Chalcedony and Alexandrite chemical formula.

Chemical formula of Chrome-Chalcedony- SiO 2 (with trace Cr minerals) Gemdat.org , Management Team (2012)
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Chrome-Chalcedony and Alexandrite Specific Gravity

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