Pearl and Alunite Physical Properties

Pearl

Alunite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.60-2.852.6-2.9

1 7.18

1.5 Fracture

Gemstones of the world (2001), UnevenWalter Schumann, Gemstones of the world (2001)

Conchoidal, Uneven

1.6 Cleavage

none

On {0001}, perfect

1.7 Mohs Hardness

2.5-4.53.5-4

2 10

1.8 Chemical Composition

Not Available

KAl3(SO4)2(OH)6

Pearl and Alunite Chemical Formula

While comparing Pearl and Alunite 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 Pearl and Alunite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6

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Pearl and Alunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pearl and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pearl and Alunite Optical Properties during the identification of gemstone. Specific gravity of Pearl is 2.6-2.9 whereas that of Alunite is 2.6-2.9.