Iolite and Howlite Physical Properties

Iolite

Howlite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.72.45-2.58

1 7.18

1.5 Fracture

Not Available

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

1.6 Cleavage

3,1

None

1.7 Mohs Hardness

7-7.53-3.5

2 10

1.8 Chemical Composition

Mg₂Al₄Si₅O₁₈

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

Iolite and Howlite Chemical Formula

While comparing Iolite 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 Iolite and Howlite chemical formula.

Chemical formula of Iolite- Mg₂Al₄Si₅O₁₈
Chemical formula of Howlite- Ca 2B 5SiO 9(OH) 5Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Iolite and Howlite Specific Gravity

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