Wood Opal

Yellowish or brownish Opal as petrified wood.
General Information
A variety or type of:Common Opal, which is a variety of Opal
Other Names/Trade Names:
Chemical Formula
SiO
 
2
· nH
 
2
O
Walter Schumann, Gemstones of the world (2001)
Physical Properties of Wood Opal
Mohs Hardness5.5 to 6.5
Walter Schumann, Gemstones of the world (2001)
Specific Gravity1.98 to 2.50
Walter Schumann, Gemstones of the world (2001)
TenacityBrittle
Walter Schumann, Gemstones of the world (2001)
Cleavage QualityNone
Walter Schumann, Gemstones of the world (2001)
Optical Properties of Wood Opal
Refractive Index1.37 to 1.52
Walter Schumann, Gemstones of the world (2001)
Colour
Colour (General)Yellowish, brownish
Walter Schumann, Gemstones of the world (2001)
Further Information
Mineral information:Wood Opal information at mindat.org
Significant Gem Localities
Australia
 
  • Queensland
    • Paroo Shire
USA
 
  • Nevada
    • Humboldt Co.
NBMG files No. 50600003
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