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Agassiz and Desor 1846 (sea urchin)
Cephalopoda - Ammonitida - Vascoceratidae
Nascimento and Zaher 2011
It comes from the wonderful middle Ordovician of the South of Morocco
These irregularly-coiled ammonites are called heteromorph ammonites
20929 - Beautiful Malachite Crystals on Barite Matrix - Taouz Barite Mines (Morocco) Mosasaur Jaws Agassiz and Desor 1846 (seaMalachite is a copper carbonate hydroxide mineral, with the formula Cu2CO3(OH)2. This opaque, green banded mineral crystallizes in the monoclinic crystal system, and most often forms botryoidal, fibrous, or stalagmitic masses, in fractures and spaces, deep underground, where the water table and hydrothermal fluids provide the means for chemical precipitation. Individual crystals are rare but do occur as slender to acicular prisms. Pseudomorphs after
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