DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Detail of a polished slab of "Ocean Jasper", a type of chalcedony that was precipitated in a volcanic (rhyolitic) environment, this particular variety coming from a location in Northern Madgascar. Precipitation of the chalcedony in a characteristic rounded form in this rock accounts for its alternative and more scientific name "Orbicular Jasper". A void, left after the precipitation of chalcedony was completed, later filled up with crystalline quartz, as is often seen in geodes and agates. Actual size is 80 x 130 mm.
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