Dumortierite and Astrophyllite Physical Properties

Dumortierite

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

3.26-3.413.2-3.4

1 7.18

1.5 Fracture

Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references

Uneven, Brittle, Metallic

1.6 Cleavage

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

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

7-8.53

2 10

1.8 Chemical Composition

AlAl₆O₃BSi₃O₁₈

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

Dumortierite and Astrophyllite Chemical Formula

While comparing Dumortierite 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 Dumortierite and Astrophyllite chemical formula.

Chemical formula of Dumortierite- AlAl₆O₃BSi₃O₁₈
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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Dumortierite and Astrophyllite Specific Gravity

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