Spinel and Willemite Physical Properties

Spinel

Willemite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

none

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.64-3.663.89-4.18

1 7.18

2.4 Fracture

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Uneven

2.5 Cleavage

None, but may exhibit slight parting

{0001}, {11 2 0} imperfect

2.6 Mohs Hardness

85.5

2 10

2.12 Chemical Composition

MgAl₂O₄

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

Spinel and Willemite Chemical Formula

While comparing Spinel 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 Spinel and Willemite chemical formula.

Chemical formula of Spinel- MgAl₂O₄
Chemical formula of Willemite- Zn 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Spinel and Willemite Specific Gravity

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