Astrophyllite and Oligoclase Physical Properties

Astrophyllite

Oligoclase

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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

3.2-3.42.62-2.67

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Gems, Sixth Edition (2006), Gems, Sixth Edition (2006), Uneven

1.6 Cleavage

Perfect on [001] imperfect on [100]

From the Greek, oligos and kasein, little cleavage.

1.7 Mohs Hardness

36-6.5

2 10

1.8 Chemical Composition

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

Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

Astrophyllite and Oligoclase Chemical Formula

While comparing Astrophyllite and Oligoclase 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 Oligoclase 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 Oligoclase- Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael OâDonoghue , Gems, Sixth Edition (2006)

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Astrophyllite and Oligoclase Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Oligoclase Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Oligoclase Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.62-2.67 whereas that of Oligoclase is 2.62-2.67.