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Much of the Ethiopian opal, or welo opal, is produced from one area of layered volcanic rocks. The main vein is a opalized deposition of fragmented volcanic rock, possibly from a pyroclastic flow, up to one meter thick, and lies on a base of impermeable clay. The opal likely formed after silica-rich waters accumulated on top of the clay, and silica gel precipitated in the spaces of the fragmented volcanic rock, and was later transformed into opal.
These welo opals and their sterling silver studs are 10mm in diameter.