Alexandrite and Gedrite Physical Properties

Alexandrite

Gedrite

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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

3.69-3.813.15-3.259

1 7.18

1.5 Fracture

Not Available

1.6 Cleavage

1,1 ; 3,2.

Gedrite Magnesiogedrite , Comments: Dark gray cleavage fragment of magnesiogedrite (gedrite). , Location: Bamble, Telemark, Norway. , Scale: See Image.

1.7 Mohs Hardness

8.55.5-6

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

(Mg,Fe2+ ) 2[(Mg,Fe2+ ) 3Al 2](Si 6Al 2)O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)

Alexandrite and Gedrite Chemical Formula

While comparing Alexandrite and Gedrite 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 Alexandrite and Gedrite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Gedrite- (Mg,Fe2+ ) 2[(Mg,Fe2+ ) 3Al 2](Si 6Al 2)O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)

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Alexandrite and Gedrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Gedrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Gedrite Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 3.15-3.259 whereas that of Gedrite is 3.15-3.259.