Proper noun
English Wikipedia has an article on:OpalsWikipedia
Opals
(chiefly Australia) The women's national basketball representative team of Australia.
Due to the popularity of Scott's novel, people began to associate opals with bad luck and death. Source: Internet
Jewellery of the Art Nouveau period revitalized the jeweller's art, with nature as the principal source of inspiration, complemented by new levels of virtuosity in enameling and the introduction of new materials, such as opals and semi-precious stones. Source: Internet
"Diffraction of light by opals," Acta Crystallographica A24, pages 427–434. Source: Internet
Nevertheless, opals can be roughly divided into those that show no signs of crystalline order ( amorphous opal) and those that show signs of the beginning of crystalline order, commonly termed cryptocrystalline or microcrystalline opal. Source: Internet
Australian opals are only mined in a few select places around the country, making it one of the most profitable stones in the Pacific. Source: Internet
Fire opals that do not show play of color are sometimes referred to as jelly opals. Source: Internet