Spinel and Alunite Physical Properties

Spinel

Alunite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

none

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.64-3.662.6-2.9

1 7.18

1.5 Fracture

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

Conchoidal, Uneven

1.6 Cleavage

None, but may exhibit slight parting

On {0001}, perfect

1.7 Mohs Hardness

83.5-4

2 10

1.8 Chemical Composition

MgAl₂O₄

KAl3(SO4)2(OH)6

Spinel and Alunite Chemical Formula

While comparing Spinel 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 Spinel and Alunite chemical formula.

Chemical formula of Spinel- MgAl₂O₄
Chemical formula of Alunite- KAl3(SO4)2(OH)6

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Spinel and Alunite Specific Gravity

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