Herderite and Sillimanite Physical Properties

Herderite

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

2.90-3.023.20-3.26

1 7.18

1.5 Fracture

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

Splintery

1.6 Cleavage

Indistinct on {110}

{010} perfect

1.7 Mohs Hardness

5-5.56-7.5

2 10

1.8 Chemical Composition

CaBePO 4(F,OH)Ulrich Henn and Claudio C.

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

Herderite and Sillimanite Chemical Formula

While comparing Herderite 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 Herderite and Sillimanite chemical formula.

Chemical formula of Herderite- CaBePO 4(F,OH)Ulrich Henn and Claudio C.
Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Herderite and Sillimanite Specific Gravity

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