Legrandite and Precious Opal Physical Properties

Legrandite

Precious Opal

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.6 Specific Gravity

3.98-4.041.98-2.25

1 7.18

2.5 Fracture

Conchoidal, UnevenArthur Thomas, Gemstones (2009), Brittle

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references

2.6 Cleavage

Imperfect, poor one {100}

Not Available

2.7 Mohs Hardness

4.5-55-6.5

2 10

3.8 Chemical Composition

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

SiO 2 · nH 2OGemdat.org , Management Team (2012)

Legrandite and Precious Opal Chemical Formula

While comparing Legrandite and Precious Opal 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 Legrandite and Precious Opal chemical formula.

Chemical formula of Legrandite- Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Precious Opal- SiO 2 · nH 2OGemdat.org , Management Team (2012)

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Legrandite and Precious Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Legrandite and Precious Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Legrandite and Precious Opal Optical Properties during the identification of gemstone. Specific gravity of Legrandite is 1.98-2.25 whereas that of Precious Opal is 1.98-2.25.