Hercynite and Herderite Physical Properties

Hercynite

Herderite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

4.392.90-3.02

1 7.18

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Fracture

Uneven

Subconchoidal, Conchoidal

Cleavage

{111} Indistinct, {111} Indistinct, {111} Indistinct

Indistinct on {110}

Mohs Hardness

7.5-85-5.5

2 10

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Chemical Composition

Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

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

Hercynite and Herderite Chemical Formula

While comparing Hercynite and Herderite 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 Hercynite and Herderite chemical formula.

Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
Chemical formula of Herderite- CaBePO 4(F,OH)Ulrich Henn and Claudio C.

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Hercynite and Herderite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Hercynite and Herderite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hercynite and Herderite Optical Properties during the identification of gemstone. Specific gravity of Hercynite is 2.90-3.02 whereas that of Herderite is 2.90-3.02.