Astrophyllite and Polyhalite Physical Properties

Astrophyllite

Polyhalite

Add ⊕

1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.42.78

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Conchoidal, Brittle

1.6 Cleavage

Perfect on [001] imperfect on [100]

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

1.7 Mohs Hardness

33.5

2 10

1.8 Chemical Composition

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

Not Available

Astrophyllite and Polyhalite Chemical Formula

While comparing Astrophyllite and Polyhalite 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 Polyhalite 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 Green Gemstones

Astrophyllite Vs Blue John

Astrophyllite Vs Black Opal

Astrophyllite Vs Bloodstone Heliotrope

Astrophyllite and Polyhalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.78 whereas that of Polyhalite is 2.78.