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Yowah nut
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The Yowah nut is a type of precious opal, found within the Yowah opal fields situated at Yowah, Shire of Paroo, South West Queensland, Australia since the latter part of the 19th century. These opals
The Yowah opal field in the Shire of Paroo
The Yowah opal field in the Shire of Paroo
An unopened Yowah nut located in Yowah, South West Queensland.
An unopened Yowah nut located in Yowah, South West Queensland.
Opal inside a Yowah nut
Opal inside a Yowah nut
Opal
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Opal is a hydrated amorphous form of silica ; its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to the amorphous physical structure, it is classified as a mi
Opal
A rich seam of iridescent opal encased in matrix
A rich seam of iridescent opal encased in matrix
Main opal producing countries
Main opal producing countries
Precious opal consists of a regular arrangement of silica nanospheres in closely packed planes (idealized diagram).
Precious opal consists of a regular arrangement of silica nanospheres in closely packed planes (idealized diagram).
This precious rough opal from Coober Pedy, South Australia, displays nearly every color of the visible spectrum.
This precious rough opal from Coober Pedy, South Australia, displays nearly every color of the visible spectrum.