Iolite and Legrandite Physical Properties

Iolite

Legrandite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.6-2.73.98-4.04

1 7.18

1.5 Fracture

Not Available

Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

3,1

Imperfect, poor one {100}

1.7 Mohs Hardness

7-7.54.5-5

2 10

1.8 Chemical Composition

Mg₂Al₄Si₅O₁₈

Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Iolite and Legrandite Chemical Formula

While comparing Iolite and Legrandite 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 Legrandite chemical formula.

Chemical formula of Iolite- Mg₂Al₄Si₅O₁₈
Chemical formula of Legrandite- Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Iolite and Legrandite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Iolite and Legrandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Iolite and Legrandite Optical Properties during the identification of gemstone. Specific gravity of Iolite is 3.98-4.04 whereas that of Legrandite is 3.98-4.04.