Creedite and Alexandrite Physical Properties

Creedite

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

2.703.69-3.81

1 7.18

1.5 Fracture

Uneven, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

Not Available

1.6 Cleavage

Perfect on {100}

1,1 ; 3,2.

1.7 Mohs Hardness

4.58.5

2 10

1.8 Chemical Composition

Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.

BeAl ₂ O ₄

Creedite and Alexandrite Chemical Formula

While comparing Creedite 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 Creedite and Alexandrite chemical formula.

Chemical formula of Creedite- Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Creedite and Alexandrite Specific Gravity

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