Alunite and Hurlbutite Physical Properties

Alunite

Hurlbutite

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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

2.6-2.92.90

1 7.18

1.5 Fracture

Conchoidal, Uneven

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

1.6 Cleavage

On {0001}, perfect

None

1.7 Mohs Hardness

3.5-46

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

CaBe 2(PO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

Alunite and Hurlbutite Chemical Formula

While comparing Alunite and Hurlbutite 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 Hurlbutite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Hurlbutite- CaBe 2(PO 4) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

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Alunite and Hurlbutite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Hurlbutite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Hurlbutite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.90 whereas that of Hurlbutite is 2.90.