20928 - Beautiful Malachite Crystals on Barite Matrix - Taouz Barite Mines (Morocco) Spinosaur Bones Applied Petrology Laboratory (APPLIED PETROLOGY

Applied Petrology Laboratory (APPLIED PETROLOGY LABORATORY

Stelckaspis

where a large amount of metal and sulfides can be seen

Some of its alveoli are preserved

†Acanthoceras sp

20928 - Beautiful Malachite Crystals on Barite Matrix - Taouz Barite Mines (Morocco) Spinosaur Bones Applied Petrology Laboratory (APPLIED PETROLOGYMalachite 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