Erythrite and Pargasite Physical Properties

Erythrite

Pargasite

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1 Physical Properties

1.1 Tenacity

Sectile

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.063.04-3.26

1 7.18

1.5 Fracture

Sectile Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Splintery, Brittle, Uneven

1.6 Cleavage

Perfect on {010}; poor on {100} and { 1 02}.

{110} perfect

1.7 Mohs Hardness

Not Available5-6

2 10

1.8 Chemical Composition

Co3(AsO4)2•8(H2O)

NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

Erythrite and Pargasite Chemical Formula

While comparing Erythrite and Pargasite 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 Erythrite and Pargasite chemical formula.

Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)
Chemical formula of Pargasite- NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)

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Erythrite and Pargasite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Erythrite and Pargasite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Erythrite and Pargasite Optical Properties during the identification of gemstone. Specific gravity of Erythrite is 3.04-3.26 whereas that of Pargasite is 3.04-3.26.