20931 - Beautiful Malachite Crystals on Barite Matrix - Taouz Barite Mines (Morocco) Olcostephanus Wolfgang Stinnesbeck & José Guadalupe

Wolfgang Stinnesbeck & José Guadalupe López-Oliva (2007): Cranial anatomy of a Maastrichtian (Upper Cretaceous) mosasaur (Squamata

They are not usual

This ammonite species is a biostratigraphic marker of the Upper Cretaceous

93 Inch = 23

It has some glued fractures but not restored or fabricated

20931 - Beautiful Malachite Crystals on Barite Matrix - Taouz Barite Mines (Morocco) Olcostephanus Wolfgang Stinnesbeck & José GuadalupeMalachite 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