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It was discovered in 1906 near the village of Kitkiöjärvi in northern Sweden
Unlike in calcite
not knowing the danger
its genus (Potamon) has a lineage that dates back to at least the Miocene
Triple Ophiuroidea Brittle Star | Morocco Cabochon It was discovered in 1906Ophiuroidea Brittle Star Late Ordovician El Kaid Errami Valley Tafilalt, Morocco Specimen approx. size: 1. 5" x 1", 1" x 1", & 1" x 0. 5" Matrix approx. size: 5. 75" x 3. 25" x 1. 125" Members of the class Ophiuroidea, commonly known as brittle stars, are echinoderms distinguished by a small central disc and five slender, flexible arms clearly separated from the disc. Their skeleton is composed of articulated calcite plates (ossicles), often found
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