Hercynite and Rock Crystal Physical Properties

Hercynite

Rock Crystal

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4.392.65

1 7.18

1.5 Fracture

ConchoidalGemdat.org, Uneven

ConchoidalWalter Schumann, Gemstones of the world (2001), ConchoidalWalter Schumann, Gemstones of the world (2001)

1.6 Cleavage

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

Not Available

1.7 Mohs Hardness

7.5-87

2 10

1.8 Chemical Composition

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

SiO 2Walter Schumann , Gemstones of the world (2001)

Hercynite and Rock Crystal Chemical Formula

While comparing Hercynite and Rock Crystal 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 Rock Crystal chemical formula.

Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
Chemical formula of Rock Crystal- SiO 2Walter Schumann , Gemstones of the world (2001)

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Hercynite and Rock Crystal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Hercynite and Rock Crystal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hercynite and Rock Crystal Optical Properties during the identification of gemstone. Specific gravity of Hercynite is 2.65 whereas that of Rock Crystal is 2.65.