Alunite and Forsterite Physical Properties

Alunite

Forsterite

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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

2.6-2.93.23-3.26

1 7.18

1.5 Fracture

Conchoidal, Uneven

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

1.6 Cleavage

On {0001}, perfect

Perfect on {010} imperfect on {100}

1.7 Mohs Hardness

3.5-46.5-7

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

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

Alunite and Forsterite Chemical Formula

While comparing Alunite and Forsterite 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 Forsterite chemical formula.

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

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Alunite and Forsterite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Forsterite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Forsterite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.23-3.26 whereas that of Forsterite is 3.23-3.26.