Astrophyllite and Willemite Physical Properties

Astrophyllite

Willemite

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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

3.2-3.43.89-4.18

1 7.18

1.5 Fracture

Uneven, Brittle, Metallic

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Uneven

1.6 Cleavage

Perfect on [001] imperfect on [100]

{0001}, {11 2 0} imperfect

1.7 Mohs Hardness

35.5

2 10

1.8 Chemical Composition

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

Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Astrophyllite and Willemite Chemical Formula

While comparing Astrophyllite and Willemite 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 Willemite 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 Willemite- Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Astrophyllite and Willemite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Astrophyllite and Willemite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Astrophyllite and Willemite Optical Properties during the identification of gemstone. Specific gravity of Astrophyllite is 3.89-4.18 whereas that of Willemite is 3.89-4.18.