Hercynite and Astrophyllite Physical Properties

Hercynite

Astrophyllite

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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

4.393.2-3.4

1 7.18

1.5 Fracture

ConchoidalGemdat.org, Uneven

Uneven, Brittle, Metallic

1.6 Cleavage

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

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

7.5-83

2 10

1.8 Chemical Composition

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

(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

Hercynite and Astrophyllite Chemical Formula

While comparing Hercynite and Astrophyllite 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 Astrophyllite chemical formula.

Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)

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Hercynite and Astrophyllite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Hercynite and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hercynite and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Hercynite is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.