Polyhalite and Alunite Physical Properties

Polyhalite

Alunite

Add ⊕

1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

2.782.6-2.9

1 7.18

1.5 Fracture

Conchoidal, Brittle

Conchoidal, Uneven

1.6 Cleavage

Perfect on {10 1 }; parting on {010}

On {0001}, perfect

1.7 Mohs Hardness

3.53.5-4

2 10

1.8 Chemical Composition

Not Available

KAl3(SO4)2(OH)6

Polyhalite and Alunite Chemical Formula

While comparing Polyhalite 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 Polyhalite and Alunite chemical formula.

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

Compare Red Gemstones

Polyhalite Vs Vanadinite

Polyhalite Vs Jacinth

Polyhalite Vs Heliotrope

Polyhalite and Alunite Specific Gravity

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