Andalusite and Boulder Opal Physical Properties

Andalusite

Boulder Opal

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.05-3.211.98-2.25

1 7.18

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Fracture

Uneven, Subconchoidal, Splintery

Conchoidal

Cleavage

Good on {110}, poor on {100}

None

Mohs Hardness

7.55-6.5

2 10

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Chemical Composition

Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

SiO 2 + H 2OUlrich Henn and Claudio C.

Andalusite and Boulder Opal Chemical Formula

While comparing Andalusite and Boulder 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 Andalusite and Boulder Opal chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

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Andalusite and Boulder Opal Specific Gravity

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