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Spinel
Spinel

Boulder Opal
Boulder Opal



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Spinel
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Boulder Opal

Spinel and Boulder Opal Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
none
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.64-3.661.98-2.25
Amber
1 7.18
1.5 Fracture
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
1.6 Cleavage
None, but may exhibit slight parting
Not Available
1.7 Mohs Hardness
85-6.5
Amber
2 10
1.8 Chemical Composition
MgAl2O4
SiO 2 + H 2OUlrich Henn and Claudio C.

Spinel and Boulder Opal Chemical Formula

While comparing Spinel and Boulder 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 Boulder Opal chemical formula.

  • Chemical formula of Spinel- MgAl2O4
  • Chemical formula of Boulder Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

Spinel and Boulder Opal Specific Gravity

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