Crocoite and Alunite Physical Properties

Crocoite

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

5.90-6.102.6-2.9

1 7.18

1.5 Fracture

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), (e.g. graphite).

Conchoidal, Uneven

1.6 Cleavage

{110} Distinct, {001} Indistinct, {100} Indistinct

On {0001}, perfect

1.7 Mohs Hardness

2.5-33.5-4

2 10

1.8 Chemical Composition

PbCrO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

KAl3(SO4)2(OH)6

Crocoite and Alunite Chemical Formula

While comparing Crocoite 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 Crocoite and Alunite chemical formula.

Chemical formula of Crocoite- PbCrO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Alunite- KAl3(SO4)2(OH)6

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Crocoite and Alunite Specific Gravity

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