Peridot and Astrophyllite Physical Properties

Peridot

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

1.54-1.553.2-3.4

1 7.18

1.5 Fracture

Conchoidal

Uneven, Brittle, Metallic

1.6 Cleavage

Poor

Perfect on [001] imperfect on [100]

1.7 Mohs Hardness

6.5-73

2 10

1.8 Chemical Composition

(Mg,Fe)₂SiO₄

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

Peridot and Astrophyllite Chemical Formula

While comparing Peridot 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 Peridot and Astrophyllite chemical formula.

Chemical formula of Peridot- (Mg,Fe)₂SiO₄
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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Peridot and Astrophyllite Specific Gravity

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