Spinel and Wood Opal Physical Properties

Spinel

Wood Opal

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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

3.64-3.661.98-2.50

1 7.18

1.5 Fracture

Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)

Not Available

1.6 Cleavage

None, but may exhibit slight parting

Not Available

1.7 Mohs Hardness

85.5-6.5

2 10

1.8 Chemical Composition

MgAl₂O₄

SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Spinel and Wood Opal Chemical Formula

While comparing Spinel and Wood 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 Spinel and Wood Opal chemical formula.

Chemical formula of Spinel- MgAl₂O₄
Chemical formula of Wood Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

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Spinel and Wood Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Spinel and Wood Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Spinel and Wood Opal Optical Properties during the identification of gemstone. Specific gravity of Spinel is 1.98-2.50 whereas that of Wood Opal is 1.98-2.50.