Astrophyllite and Dumortierite Physical Properties

Astrophyllite

Dumortierite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.2-3.43.26-3.41

1 7.18

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Fracture

Uneven

Fibrous, ConchoidalWalter Schumann

Cleavage

Perfect on [001] imperfect on [100]

Distinct on {100}, poor on {110}; parting on {001}

Mohs Hardness

37-8.5

2 10

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Chemical Composition

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

AlAl₆O₃BSi₃O₁₈

Astrophyllite and Dumortierite Chemical Formula

While comparing Astrophyllite and Dumortierite 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 Dumortierite 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 Dumortierite- AlAl₆O₃BSi₃O₁₈

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Astrophyllite and Dumortierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Dumortierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Dumortierite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.26-3.41 whereas that of Dumortierite is 3.26-3.41.