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Thunderegg
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A thunderegg is a nodule-like rock, similar to a filled geode, that is formed within rhyolitic volcanic ash layers. Thundereggs are rough spheres, most about the size of a baseball—though they can ran
A thunderegg from the Black Rock Desert in Nevada that has been cut in half
A thunderegg from the Black Rock Desert in Nevada that has been cut in half
A thunderegg from Succor Creek on display at the Oregon State Capitol
A thunderegg from Succor Creek on display at the Oregon State Capitol
A thunderegg agate from Falen Tree, Oregon, US
A thunderegg agate from Falen Tree, Oregon, US
A jasper thunderegg from White Fir Springs, Oregon
A jasper thunderegg from White Fir Springs, Oregon
Jasper
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Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, is an opaque, impure variety of silica, usually red, yellow, brown or green in color; and rar
Jasper
Movable Egyptian ring in green jasper and gold, from 664 to 322 BC or later (Late Period), the Walters Art Museum
Movable Egyptian ring in green jasper and gold, from 664 to 322 BC or later (Late Period), the Walters Art Museum
Amulet of scarlet jasper, provenance unknown, Royal Pump Room, Harrogate
Amulet of scarlet jasper, provenance unknown, Royal Pump Room, Harrogate
Low-relief sphinx pendant, red jasper, pearl and enamel, French, circa 1870
Low-relief sphinx pendant, red jasper, pearl and enamel, French, circa 1870