Astrophyllite and Vivianite Physical Properties

Astrophyllite

Vivianite

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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

3.2-3.42.64-2.70

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

(e.g. graphite).

1.6 Cleavage

Perfect on [001] imperfect on [100]

{010} Perfect

1.7 Mohs Hardness

3Not Available

2 10

1.8 Chemical Composition

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

Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.

Astrophyllite and Vivianite Chemical Formula

While comparing Astrophyllite and Vivianite 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 Astrophyllite and Vivianite chemical formula.

Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Chemical formula of Vivianite- Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.

Compare Green Gemstones

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Astrophyllite and Vivianite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Vivianite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Vivianite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.64-2.70 whereas that of Vivianite is 2.64-2.70.