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fragmented rock produces brecciated (broken) jasper
This fancy gemstone has indeed inspired creativity in many artists
Plume is surprisingly more common than most of us might believe
Spinel forms in the same rock units
Rare Boulder Opal freeform faceted beads (ETB00457) Size:A fragmented rock produces brecciated (broken)Australian Boulder opals are the second most valuable type of opal (following black opal). Boulder opals are easily distinguished by their layer of solid brown ironstone left on the back of the stone. Boulder opals, as the name suggests, are mined from large ironstone boulders under the ground. Thin veins of colourful opal forms in cracks and fissures in these boulders. Because these veins of colour are so thin, opal cutters need to leave the
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