Galena and Sillimanite Physical Properties

Galena

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

6.233.20-3.26

1 7.18

1.5 Fracture

Subconchoidal, Brittle, Metallic

Splintery

1.6 Cleavage

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

{010} perfect

1.7 Mohs Hardness

2.5-2.756-7.5

2 10

1.8 Chemical Composition

PbS

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Galena and Sillimanite Chemical Formula

While comparing Galena and Sillimanite 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 Sillimanite chemical formula.

Chemical formula of Galena- PbS
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

Compare Grey Gemstones

Galena Vs Clinochlore

Galena Vs Larvikite

Galena Vs Falcons Eye

Galena and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Galena and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Galena and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Galena is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.