Astrophyllite and Precious Opal Physical Properties

Astrophyllite

Precious Opal

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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

3.2-3.41.98-2.25

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

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

1.6 Cleavage

Perfect on [001] imperfect on [100]

Not Available

1.7 Mohs Hardness

35-6.5

2 10

1.8 Chemical Composition

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

SiO 2 · nH 2OGemdat.org , Management Team (2012)

Astrophyllite and Precious Opal Chemical Formula

While comparing Astrophyllite and Precious 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 Precious 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 Precious Opal- SiO 2 · nH 2OGemdat.org , Management Team (2012)

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Astrophyllite and Precious Opal Specific Gravity

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