Galena and Apatite Physical Properties

Galena

Apatite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

6.233.16-3.23

1 7.18

1.5 Fracture

Subconchoidal, Brittle, Metallic

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

1.6 Cleavage

Cubic perfect on [001], parting on [111]

[0001] indistinct, [1010] indistinct

1.7 Mohs Hardness

2.5-2.755

2 10

1.8 Chemical Composition

PbS

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

Galena and Apatite Chemical Formula

While comparing Galena and Apatite 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 Galena and Apatite chemical formula.

Chemical formula of Galena- PbS
Chemical formula of Apatite- Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references

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Galena and Apatite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Galena and Apatite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Galena and Apatite Optical Properties during the identification of gemstone. Specific gravity of Galena is 3.16-3.23 whereas that of Apatite is 3.16-3.23.