Australia in opalOne of many opal mining sites in the red continent is called Yowah, and is famous f
Australia in opalOne of many opal mining sites in the red continent is called Yowah, and is famous for its opal nuts, veins of precious glowing opal within nodules of siliceous ironstone that often form amazing patterns. They vary from 0.5 to 20 cm across, and occur in an iron rich sandstone, near the border with an adjoining mudstone. How fitting that the source of some of the loveliest opals should be immortalised by nature in its national gem.LozImage credit: cobalt63http://www.dnrm.qld.gov.au/mining/fossicking/area-guides/western-opal/yowah -- source link
#australia#fire opal#yowah#continent#shape