Opal Pineapple segment

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This is an incredibly rare Segment of an Opal 'Pineapple' This unique opalised mineral is found only in White Cliffs NSW, Australia.It is a double pseudomorph (opal after calcite a fter ikaite ) it changed crystal structures twice & was later replaced by Opal. An incredible set of circumstances had to occur in the Earths history for this to happen. A great piece for a new collector. Show more