Umbalite and Dravite Physical Properties

Umbalite

Dravite

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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

3.62-4.333.03-3.18

1 7.18

1.5 Fracture

Uneven, Uneven, ConchoidalGemdat.org, Management Team (2012)

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

1.6 Cleavage

Not Available

{???} Indistinct

1.7 Mohs Hardness

7-7.57-7.5

2 10

1.8 Chemical Composition

Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)

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

Umbalite and Dravite Chemical Formula

While comparing Umbalite and Dravite 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 Umbalite and Dravite chemical formula.

Chemical formula of Umbalite- Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)
Chemical formula of Dravite- Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

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Umbalite and Dravite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Umbalite and Dravite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Umbalite and Dravite Optical Properties during the identification of gemstone. Specific gravity of Umbalite is 3.03-3.18 whereas that of Dravite is 3.03-3.18.