Fluorapatite and Achroite Physical Properties

Fluorapatite

Achroite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.1-3.252.90-3.40

1 7.18

1.5 Fracture

Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

Indistinct

Not Available

1.7 Mohs Hardness

57-7.5

2 10

1.8 Chemical Composition

Ca 5(PO 4) 3FAnthony et al , Handbook of mineralogy (2001)

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

Fluorapatite and Achroite Chemical Formula

While comparing Fluorapatite and Achroite 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 Fluorapatite and Achroite chemical formula.

Chemical formula of Fluorapatite- Ca 5(PO 4) 3FAnthony et al , Handbook of mineralogy (2001)
Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

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Fluorapatite and Achroite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Fluorapatite and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Fluorapatite and Achroite Optical Properties during the identification of gemstone. Specific gravity of Fluorapatite is 2.90-3.40 whereas that of Achroite is 2.90-3.40.