Andalusite and Grandidierite Physical Properties

Andalusite

Grandidierite

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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

3.05-3.212.85-3.00

1 7.18

1.5 Fracture

Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)

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

1.6 Cleavage

Good on {110}, poor on {100}

Perfect

1.7 Mohs Hardness

7.57.5

2 10

1.8 Chemical Composition

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

(Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.

Andalusite and Grandidierite Chemical Formula

While comparing Andalusite and Grandidierite 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 Grandidierite chemical formula.

Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references
Chemical formula of Grandidierite- (Mg,Fe)Al 3(BO 4)(SiO 4)OUlrich Henn and Claudio C.

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Andalusite and Grandidierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Andalusite and Grandidierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Andalusite and Grandidierite Optical Properties during the identification of gemstone. Specific gravity of Andalusite is 2.85-3.00 whereas that of Grandidierite is 2.85-3.00.