Moonstone and Polyhalite Physical Properties

Moonstone

Polyhalite

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Physical Properties

Tenacity

Brittle

Solubility

Soluble

Durability

Specific Gravity

2.56-2.602.78

1 7.18

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Fracture

Uneven, ConchoidalWalter Schumann

Conchoidal

Cleavage

2,1 basal ; 2,1 prismatic ; 3,1 pinacoidal

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

Mohs Hardness

6-6.53.5

2 10

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Chemical Composition

Plagioclase Feldspar s: (Na,Ca)Al_1-2Si_3-2O₈ Orthoclase Feldspar : KAlSi₃O₈

K2Ca2Mg(SO4)4·2H2O

Moonstone and Polyhalite Chemical Formula

While comparing Moonstone 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 Moonstone and Polyhalite chemical formula.

Chemical formula of Moonstone- Plagioclase Feldspar s: (Na,Ca)Al_1-2Si_3-2O₈ Orthoclase Feldspar : KAlSi₃O₈
Chemical formula of Polyhalite- K2Ca2Mg(SO4)4·2H2O

Compare Semi Precious Gemstones

Moonstone Vs Rubellite

Moonstone Vs Schorlomite

Moonstone Vs Simpsonite

Moonstone and Polyhalite Specific Gravity

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