Hibonite and Sillimanite Physical Properties

Hibonite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.843.20-3.26

1 7.18

1.5 Fracture

Subconchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle

Splintery

1.6 Cleavage

{0001} good, {10 1 0} parting

{010} perfect

1.7 Mohs Hardness

7.5-86-7.5

2 10

1.8 Chemical Composition

(Ca,Ce)(Al,Ti,Mg)12O19

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

Hibonite and Sillimanite Chemical Formula

While comparing Hibonite 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 Hibonite and Sillimanite chemical formula.

Chemical formula of Hibonite- (Ca,Ce)(Al,Ti,Mg)12O19
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Hibonite and Sillimanite Specific Gravity

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