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Slab of white, irridescent opal
Description:
A slab of white, iridescent opal. Opal is composed of microspheroids of hydrous silicon oxide. It is the refraction of light within these spheroids which gives the mineral its iridescent, mother-of- pearl-like sheen. Opal never occurs in a crystaline form, but as small veins, globules and crusts. Several varieties occur; colourless, milky white, hazy blue, red (fire opal) and black types and also a type of fossilised wood know as wood opal. Black and fire opals are particularly valued as gemstones. This specimen measures 9 x 7 cm and was found in Pedro II, Piaui, Brazil.
Credit:
Roberto de Gugliemo/Science Source
Unique identifier:
SS2177803
Legacy Identifier:
SC5576
Type:
Image
Size:
2811px × 3542px (~28 MB)
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Tags
E425/0303
E425/303
E4250303
earth science
geology
opal
white
