Astrophyllite and Opal Physical Properties

Astrophyllite

Opal

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1 Physical Properties

1.1 Tenacity

Not Available

BrittleWalter Schumann

1.2 Solubility

Not Available

hot salt water

1.3 Durability

Not Available

1.4 Specific Gravity

3.2-3.4

1.98-2.25

1.5 Fracture

Uneven, Brittle, Metallic

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle

1.6 Cleavage

Perfect on [001] imperfect on [100]

None

1.7 Mohs Hardness

5-6.5

1.8 Chemical Composition

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

SiO₂ · nH₂O

Astrophyllite and Opal Chemical Formula

While comparing Astrophyllite and Opal 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 Opal 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 Opal- SiO₂ · nH₂O

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Astrophyllite and Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Opal Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 1.98-2.25 whereas that of Opal is 1.98-2.25.