Iddingsite and Andalusite Physical Properties

Iddingsite

Andalusite

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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

2.5-2.8

3.05-3.21

1.5 Fracture

Not Available

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

1.6 Cleavage

{???} Perfect

Good on {110}, poor on {100}

1.7 Mohs Hardness

7.5

1.8 Chemical Composition

MgO.Fe2O3.3SiO2•4(H2O)

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

Iddingsite and Andalusite Chemical Formula

While comparing Iddingsite and Andalusite 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 Iddingsite and Andalusite chemical formula.

Chemical formula of Iddingsite- MgO.Fe2O3.3SiO2•4(H2O)
Chemical formula of Andalusite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth edition (2006) More from other references

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Iddingsite and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Iddingsite and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Iddingsite and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Iddingsite is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.