Fayalite and Alunite Physical Properties

Fayalite

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

4.3922.6-2.9

1 7.18

1.5 Fracture

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

Conchoidal, Uneven

1.6 Cleavage

{010} moderate, {100} imperfect

On {0001}, perfect

1.7 Mohs Hardness

6.5-73.5-4

2 10

1.8 Chemical Composition

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

KAl3(SO4)2(OH)6

Fayalite and Alunite Chemical Formula

While comparing Fayalite 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 Fayalite and Alunite chemical formula.

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

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Fayalite and Alunite Specific Gravity

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