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This piece has been stabilized on its surface by Paraloid B-72 to ensure its stability and consistency
with a circular basal cross-section
A preparation like this without small restorations is impossible
Wolfgang Stinnesbeck & José Guadalupe López-Oliva (2007): Cranial anatomy of a Maastrichtian (Upper Cretaceous) mosasaur (Squamata
20931 - Beautiful Malachite Crystals on Barite Matrix - Taouz Barite Mines (Morocco) Olcostephanus This piece has been stabilizedMalachite 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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