Galena and Sugilite Physical Properties

Galena

Sugilite

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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

6.232.69-2.79

1 7.18

1.5 Fracture

Subconchoidal, Brittle, Metallic

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

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

Poor on {0001}

1.7 Mohs Hardness

2.5-2.755.5-6.5

2 10

1.8 Chemical Composition

PbS

KNa 2(Fe3+ ,Mn3+ ,Al) 2Li 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Galena and Sugilite Chemical Formula

While comparing Galena and Sugilite 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 Sugilite chemical formula.

Chemical formula of Galena- PbS
Chemical formula of Sugilite- KNa 2(Fe3+ ,Mn3+ ,Al) 2Li 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Galena Vs Larvikite

Galena and Sugilite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Galena and Sugilite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Galena and Sugilite Optical Properties during the identification of gemstone. Specific gravity of Galena is 2.69-2.79 whereas that of Sugilite is 2.69-2.79.