Polyhalite and Astrophyllite Physical Properties

Polyhalite

Astrophyllite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.783.2-3.4

1 7.18

1.5 Fracture

Conchoidal, Brittle

Uneven, Brittle, Metallic

1.6 Cleavage

Perfect on {10 1 }; parting on {010}

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

3.53

2 10

1.8 Chemical Composition

Not Available

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

Polyhalite and Astrophyllite Chemical Formula

While comparing Polyhalite 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 Polyhalite and Astrophyllite chemical formula.

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

Compare Red Gemstones

Polyhalite Vs Jacinth

Polyhalite Vs Vanadinite

Polyhalite Vs Heliotrope

Polyhalite and Astrophyllite Specific Gravity

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