Dravite and Polyhalite Physical Properties

Dravite

Polyhalite

Add ⊕

1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.3 Solubility

Not Available

Soluble

1.5 Durability

Not Available

1.6 Specific Gravity

3.03-3.182.78

1 7.18

1.8 Fracture

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

Conchoidal, Brittle

1.9 Cleavage

{???} Indistinct

Perfect on {10 1 }; parting on {010}

1.10 Mohs Hardness

7-7.53.5

2 10

1.11 Chemical Composition

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

Not Available

Dravite and Polyhalite Chemical Formula

While comparing Dravite and Polyhalite 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 Polyhalite 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)

Compare Blue Gemstones

Dravite Vs Fluorite

Dravite Vs Gadolinium Gallium Garnet

Dravite Vs Gahnite

Dravite and Polyhalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Dravite and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dravite and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Dravite is 2.78 whereas that of Polyhalite is 2.78.