| http://www.w3.org/ns/prov#value | - I then ran some chemical tests on them and had analyses done at the university.???EMERALD OPALS AND PICTURE OPALSWhat emerged from those scientific analyses was that 31 of the 99 varieties of opal that are found in thirteen different countries, such as Australia, America, Mexico, Brazil and Peru, are found in Turkey's Oltu and ??enkaya area, which is thought to be among the richest in the world in
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