Corundum and Ludlamite Physical Properties

Corundum

Ludlamite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.90-4.053.1-3.2

1 7.18

1.5 Fracture

Uneven, Uneven, Gems, Difficult, Fibrous

UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)

1.6 Cleavage

None – parting in 3 directions

Vitreous, pearly on cleavage

1.7 Mohs Hardness

93-4

2 10

1.8 Chemical Composition

Al 2O 3Arthur Thomas , Gemstones (2009)

(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Corundum and Ludlamite Chemical Formula

While comparing Corundum and Ludlamite 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 Ludlamite chemical formula.

Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)
Chemical formula of Ludlamite- (Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Corundum and Ludlamite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Corundum and Ludlamite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Ludlamite Optical Properties during the identification of gemstone. Specific gravity of Corundum is 3.1-3.2 whereas that of Ludlamite is 3.1-3.2.