Corundum and Afghanite Physical Properties

Corundum

Afghanite

Add ⊕

1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.90-4.052.55-2.65

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Difficult, Fibrous

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle, Conchoidal, Brittle

1.6 Cleavage

None – parting in 3 directions

Perfect {10 1 0}

1.7 Mohs Hardness

95.5-6

2 10

1.8 Chemical Composition

Al 2O 3Arthur Thomas , Gemstones (2009)

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

Corundum and Afghanite Chemical Formula

While comparing Corundum and Afghanite 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 Corundum and Afghanite chemical formula.

Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)

Compare Violet Gemstones

Corundum Vs Garnet

Corundum Vs Hackmanite

Corundum Vs Hexagonite

Corundum and Afghanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Corundum and Afghanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Afghanite Optical Properties during the identification of gemstone. Specific gravity of Corundum is 2.55-2.65 whereas that of Afghanite is 2.55-2.65.