Afghanite and Montebrasite Physical Properties

Afghanite

Montebrasite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

2.55-2.652.98-3.10

1 7.18

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Fracture

Conchoidal

Uneven, Conchoidal

Cleavage

Perfect {10 1 0}

{100} Perfect, {110} Good, {011} Distinct

Mohs Hardness

5.5-65.5-6

2 10

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Chemical Composition

(Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)

LiAl(PO 4)(OH,F)Walter Schumann , Gemstones of the world (2001) More from other references

Afghanite and Montebrasite Chemical Formula

While comparing Afghanite and Montebrasite 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 Afghanite and Montebrasite chemical formula.

Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)
Chemical formula of Montebrasite- LiAl(PO 4)(OH,F)Walter Schumann , Gemstones of the world (2001) More from other references

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Afghanite and Montebrasite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Afghanite and Montebrasite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Afghanite and Montebrasite Optical Properties during the identification of gemstone. Specific gravity of Afghanite is 2.98-3.10 whereas that of Montebrasite is 2.98-3.10.