Gibbsite and Astrophyllite Physical Properties

Gibbsite

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

2.353.2-3.4

1 7.18

1.5 Fracture

Fibrous, Difficult, Fibrous

Uneven, Brittle, Metallic

1.6 Cleavage

{001} Perfect

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

2.5-33

2 10

1.8 Chemical Composition

Al(OH)3

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

Gibbsite and Astrophyllite Chemical Formula

While comparing Gibbsite 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 Gibbsite and Astrophyllite chemical formula.

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

Compare Grey Gemstones

Gibbsite Vs Vanadinite

Gibbsite Vs Galena

Gibbsite Vs Pallasite

Gibbsite and Astrophyllite Specific Gravity

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