Alunite and Moonstone Physical Properties

Alunite

Moonstone

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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

2.6-2.92.56-2.60

1 7.18

1.5 Fracture

Conchoidal, Uneven

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

On {0001}, perfect

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

1.7 Mohs Hardness

3.5-46-6.5

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

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

Alunite and Moonstone Chemical Formula

While comparing Alunite and Moonstone 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 Alunite and Moonstone chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Moonstone- Plagioclase Feldspar s: (Na,Ca)Al_1-2Si_3-2O₈ Orthoclase Feldspar : KAlSi₃O₈

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Alunite and Moonstone Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Moonstone Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Moonstone Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.56-2.60 whereas that of Moonstone is 2.56-2.60.