Pargasite and Erythrite Physical Properties

Pargasite

Erythrite

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1 Physical Properties

1.1 Tenacity

Not Available

Sectile

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.04-3.263.06

1 7.18

1.5 Fracture

Splintery, Brittle, Uneven

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

1.6 Cleavage

{110} perfect

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

1.7 Mohs Hardness

5-6Not Available

2 10

1.8 Chemical Composition

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

Co3(AsO4)2•8(H2O)

Pargasite and Erythrite Chemical Formula

While comparing Pargasite and Erythrite 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 Pargasite and Erythrite chemical formula.

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

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Pargasite and Erythrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Pargasite and Erythrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pargasite and Erythrite Optical Properties during the identification of gemstone. Specific gravity of Pargasite is 3.06 whereas that of Erythrite is 3.06.