Polyhalite and Precious Opal Physical Properties

Polyhalite

Precious Opal

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.781.98-2.25

1 7.18

1.5 Fracture

Conchoidal, Brittle

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references

1.6 Cleavage

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

Not Available

1.7 Mohs Hardness

3.55-6.5

2 10

1.8 Chemical Composition

Not Available

SiO 2 · nH 2OGemdat.org , Management Team (2012)

Polyhalite and Precious Opal Chemical Formula

While comparing Polyhalite and Precious Opal 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 Polyhalite and Precious Opal chemical formula.

Chemical formula of Precious Opal- SiO 2 · nH 2OGemdat.org , Management Team (2012)

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Polyhalite and Precious Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Precious Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Precious Opal Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 1.98-2.25 whereas that of Precious Opal is 1.98-2.25.