Polyhalite and Grossular Physical Properties

Polyhalite

Grossular

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1 Physical Properties

2.2 Tenacity

Brittle

Not Available

2.5 Solubility

Soluble

Not Available

2.6 Durability

Not Available

2.7 Specific Gravity

2.783.55-3.73

1 7.18

2.8 Fracture

Conchoidal, Brittle

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

2.9 Cleavage

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

none

2.10 Mohs Hardness

3.57-7.5

2 10

2.16 Chemical Composition

Not Available

Ca 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Polyhalite and Grossular Chemical Formula

While comparing Polyhalite and Grossular 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 Grossular chemical formula.

Chemical formula of Grossular- Ca 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Compare Red Gemstones

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Polyhalite Vs Heliotrope

Polyhalite and Grossular Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Grossular Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Grossular Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 3.55-3.73 whereas that of Grossular is 3.55-3.73.