Alunite and Howlite Physical Properties

Alunite

Howlite

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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

2.6-2.92.45-2.58

1 7.18

1.5 Fracture

Conchoidal, Uneven

UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009), Brittle, Conchoidal

1.6 Cleavage

On {0001}, perfect

None

1.7 Mohs Hardness

3.5-43-3.5

2 10

1.8 Chemical Composition

KAl3(SO4)2(OH)6

Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Alunite and Howlite Chemical Formula

While comparing Alunite and Howlite 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 Howlite chemical formula.

Chemical formula of Alunite- KAl3(SO4)2(OH)6
Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Alunite and Howlite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alunite and Howlite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alunite and Howlite Optical Properties during the identification of gemstone. Specific gravity of Alunite is 2.45-2.58 whereas that of Howlite is 2.45-2.58.