The stones once again saw a resurgence in the late 19th and early 20th century when opal deposits were discovered in ...
Black opal is one of the most enchanting stones in the world ... But over 90% of the world's opal comes from Australia. And a lot of the black opal is found here, at Lightning Ridge.
the exploiter of the Australian gem, which he clearly regards as primarily connected with living organisms. Opal: the Gem of the Never Never. By T. C. Wollaston. Pp. xi + 164 + 15 plates.