Alunite and Fayalite Physical Properties

Alunite

Fayalite

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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

2.6-2.94.392

1 7.18

1.5 Fracture

Conchoidal, Uneven

Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

1.6 Cleavage

On {0001}, perfect

{010} moderate, {100} imperfect

1.7 Mohs Hardness

3.5-46.5-7

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)

Alunite and Fayalite Chemical Formula

While comparing Alunite and Fayalite 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 Fayalite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Fayalite- Fe 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Alunite and Fayalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Fayalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Fayalite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 4.392 whereas that of Fayalite is 4.392.