micROCKScopica - Ocean Jasper

micROCKScopica - Ocean Jasper

by Bernardo Cesare, Department of Geosciences, University of Padova, Padova, Italy

Polarized light photomicrograph of a thin section of Ocean Jasper.
Ocean Jasper is an orbicular silicified rhyolite (volcanic rock) from Madagascar. The photomicrograph is a close-up of impinging spherulitic orbs showing their radiating texture of fibrous chalcedony their opaque-rich cores. Just a 4 mm across.

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