20092 - Beautiful Deep Blue Azurite Crystals on Carbonate Matrix - Kerrouchen (Morocco) Petraster chiefly chalcedony
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Description
chiefly chalcedony
Its flat morphology indicates without doubt that it is a foot claw
Didrepanon
The largest and most complete shark teeth collection on the market
A new anhanguerid pterosaur from the Cretaceous of Morocco
20092 - Beautiful Deep Blue Azurite Crystals on Carbonate Matrix - Kerrouchen (Morocco) Petraster chiefly chalcedonyAzurite is one of the two basic copper carbonate minerals, the other being bright green malachite. Simple copper carbonate (CuCO3) is not known to exist in nature. Azurite has the formula Cu3(CO3)2(OH)2, with the copper cations linked to two different anions, carbonate and hydroxide. Small crystals of azurite can be produced by rapidly stirring a few drops of copper sulfate solution into a saturated solution of sodium carbonate and allowing the
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