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Even in the wide and varied world of gemstones, cacholong is pretty obscure. The stone has certainly generated its share of confusion. Also known as kascholong, the stone is actually a variety of opal, but this hasn't stopped it from being listed as an agate on more than one occasion. It has also been described as either chalcedony or hydrophane opal. The fact that it is sometimes known as "mother of pearl opal" only adds to the complexity....
(2003) Complete Story