Astrophyllite and Natrolite Physical Properties

Astrophyllite

Natrolite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.2-3.42.20-2.26

1 7.18

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Fracture

Uneven

Cleavage

Perfect on [001] imperfect on [100]

Perfect on {110}

Mohs Hardness

35-5.5

2 10

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Chemical Composition

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

Na 2[Al 2Si 3O 10] · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Astrophyllite and Natrolite Chemical Formula

While comparing Astrophyllite and Natrolite 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 Natrolite 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 Natrolite- Na 2[Al 2Si 3O 10] · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Astrophyllite and Natrolite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Natrolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Natrolite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 2.20-2.26 whereas that of Natrolite is 2.20-2.26.