Hurlbutite and Alunite Physical Properties

Hurlbutite

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

2.902.6-2.9

1 7.18

1.5 Fracture

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

Conchoidal, Uneven

1.6 Cleavage

None

On {0001}, perfect

1.7 Mohs Hardness

63.5-4

2 10

1.8 Chemical Composition

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

KAl3(SO4)2(OH)6

Hurlbutite and Alunite Chemical Formula

While comparing Hurlbutite 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 Hurlbutite and Alunite chemical formula.

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

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Hurlbutite and Alunite Specific Gravity

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