Dravite and Spinel Physical Properties

Dravite

Spinel

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

none

1.3 Durability

Not Available

1.4 Specific Gravity

3.03-3.183.64-3.66

1 7.18

1.5 Fracture

Uneven, Uneven, Irregular, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

{???} Indistinct

None, but may exhibit slight parting

1.7 Mohs Hardness

7-7.58

2 10

1.8 Chemical Composition

Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

MgAl₂O₄

Dravite and Spinel Chemical Formula

While comparing Dravite and Spinel 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 Dravite and Spinel chemical formula.

Chemical formula of Dravite- Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)
Chemical formula of Spinel- MgAl₂O₄

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Dravite and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Dravite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Dravite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.