Apatite and Erythrite Physical Properties

Apatite

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

3.16-3.23

3.06

1.5 Fracture

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

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

1.6 Cleavage

[0001] indistinct, [1010] indistinct

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

1.7 Mohs Hardness

Not Available

1.8 Chemical Composition

Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references

Co3(AsO4)2•8(H2O)

Apatite and Erythrite Chemical Formula

While comparing Apatite 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 Apatite and Erythrite chemical formula.

Chemical formula of Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references
Chemical formula of Erythrite- Co3(AsO4)2•8(H2O)

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Apatite and Erythrite Specific Gravity

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