Astrophyllite and Turquoise Physical Properties

Astrophyllite

Turquoise

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.4

2.30-2.90

1.5 Fracture

Uneven, Brittle, Metallic

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle

1.6 Cleavage

Perfect on [001] imperfect on [100]

Good to perfect_usually N/A

1.7 Mohs Hardness

5-6

1.8 Chemical Composition

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

CuAl₆(PO₄)₄(OH)₈ • 4H₂O

Astrophyllite and Turquoise Chemical Formula

While comparing Astrophyllite and Turquoise 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 Turquoise 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 Turquoise- CuAl₆(PO₄)₄(OH)₈ • 4H₂O

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Astrophyllite and Turquoise Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Turquoise Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Turquoise Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.30-2.90 whereas that of Turquoise is 2.30-2.90.