Creedite and Hercynite Physical Properties

Creedite

Hercynite

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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

2.704.39

1 7.18

1.5 Fracture

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

ConchoidalGemdat.org, Uneven

1.6 Cleavage

Perfect on {100}

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

1.7 Mohs Hardness

4.57.5-8

2 10

1.8 Chemical Composition

Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.

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

Creedite and Hercynite Chemical Formula

While comparing Creedite and Hercynite 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 Creedite and Hercynite chemical formula.

Chemical formula of Creedite- Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.
Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

Compare Colorless Gems

Creedite Vs Diopside

Creedite Vs Dravite

Creedite Vs Diaspore

Creedite and Hercynite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Creedite and Hercynite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Creedite and Hercynite Optical Properties during the identification of gemstone. Specific gravity of Creedite is 4.39 whereas that of Hercynite is 4.39.