Astrophyllite and Staurolite Physical Properties

Astrophyllite

Staurolite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.43.7-3.8

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

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

1.6 Cleavage

Perfect on [001] imperfect on [100]

Distinct on {010}

1.7 Mohs Hardness

37-7.5

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,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.

Astrophyllite and Staurolite Chemical Formula

While comparing Astrophyllite and Staurolite 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 Staurolite 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 Staurolite- (Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.

Compare Green Gemstones

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Astrophyllite Vs Black Opal

Astrophyllite Vs Blue John

Astrophyllite and Staurolite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Staurolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Staurolite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.7-3.8 whereas that of Staurolite is 3.7-3.8.