Iddingsite and Andradite Physical Properties

Iddingsite

Andradite

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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

2.5-2.83.70-4.10

1 7.18

1.5 Fracture

Not Available

Conchoidal, Uneven, Conchoidal, Brittle, ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

{???} Perfect

none

1.7 Mohs Hardness

36.5-7

2 10

1.8 Chemical Composition

MgO.Fe2O3.3SiO2•4(H2O)

Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

Iddingsite and Andradite Chemical Formula

While comparing Iddingsite and Andradite 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 Andradite chemical formula.

Chemical formula of Iddingsite- MgO.Fe2O3.3SiO2•4(H2O)
Chemical formula of Andradite- Ca 3Fe 2(SiO 4) 3Arthur Thomas , Gemstones (2009)

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Iddingsite and Andradite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Iddingsite and Andradite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Iddingsite and Andradite Optical Properties during the identification of gemstone. Specific gravity of Iddingsite is 3.70-4.10 whereas that of Andradite is 3.70-4.10.