Polyhalite and Aragonite Physical Properties

Polyhalite

Aragonite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

Dilute acid

1.3 Durability

Not Available

1.4 Specific Gravity

2.782.93-2.96

1 7.18

1.5 Fracture

Conchoidal, Brittle

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

1.6 Cleavage

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

Distinct on {010}, imperfect {110} and {011}

1.7 Mohs Hardness

3.53.5-4

2 10

1.8 Chemical Composition

Not Available

CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Polyhalite and Aragonite Chemical Formula

While comparing Polyhalite and Aragonite 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 Aragonite chemical formula.

Chemical formula of Aragonite- CaCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Compare Red Gemstones

Polyhalite Vs Jacinth

Polyhalite Vs Vanadinite

Polyhalite Vs Heliotrope

Polyhalite and Aragonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Aragonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Aragonite Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 2.93-2.96 whereas that of Aragonite is 2.93-2.96.