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Black Opal is found mainly at Lightning Ridge N.S.W. 600km northwest of
Sydney. First noticed in the late 1800’s, it wasn’t until 1905 that the first shafts
were dug and a layer of black “potch” (non-precious opal) was discovered.
Within this layer of potch is found precious opal called Black Opal a name they
have because of their dark body colour that ranges from light grey to dark black.
Their rarity makes them the most valuable of all opals.

More about Australian Opals
Australia Black Opal mining fields map