Related articles:
Flame Queen Opal
Lightning Ridge, New South Wales
Coober Pedy, South Australia
Gemstone
South Australia
Mineraloid
Cristobalite
Diatomaceous earth
Nevada
Opalescence
Galaxy Opal
Andamooka Opal
Grand Central Terminal
Ironstone
Marl
Opalite
Key terms:
opal
color
structure
australia
silica
spheres
play of color
stone
layer
crystal
produces
south australia
varieties
black opal
world's
gemstone
stacked
synthetic
content
consisting
boulder
material
diffraction
commonly
coober pedy
thin
planes
deposits
quartz
nevada
packed
opaque
internal
amorphous
optical
queensland
microcrystalline
world's largest
visible
adapted
display
doublet
new south wales
water content
siliceous
regularity
milky
matrix
interference
plastic
correctly
triplet
basalt
glass
Search external links cited by footnotes on Wikipedia page Opal:
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