Alunite and Andalusite Physical Properties

Alunite

Andalusite

Add ⊕

1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.93.05-3.21

1 7.18

1.5 Fracture

Conchoidal, Uneven

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

1.6 Cleavage

On {0001}, perfect

Good on {110}, poor on {100}

1.7 Mohs Hardness

3.5-47.5

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Alunite and Andalusite Chemical Formula

While comparing Alunite and Andalusite 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 Andalusite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

Compare Red Gemstones

Alunite Vs Erythrite

Alunite Vs Piemontite

Alunite Vs Kainite

Alunite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.