Pay in 4 interest-free payments of $28.44 Learn more
Ships within 48 hours · Estimated delivery Sep 22 - Sep 27
chiefly chalcedony
during many hours of work
a new species of littoral turtle (Cryptodira
Didrepanon
This is a small jewel
20092 - Beautiful Deep Blue Azurite Crystals on Carbonate Matrix - Kerrouchen (Morocco) Petraster chiefly chalcedonyAzurite is one of the two basic copper carbonate minerals, the other being bright green malachite. Simple copper carbonate (CuCO3) is not known to exist in nature. Azurite has the formula Cu3(CO3)2(OH)2, with the copper cations linked to two different anions, carbonate and hydroxide. Small crystals of azurite can be produced by rapidly stirring a few drops of copper sulfate solution into a saturated solution of sodium carbonate and allowing the
US$ 20.99
US$ 23.99
US$ 20.99
US$ 199.00
US$ 564.50
US$ 20.99
US$ 21.99
US$ 26.99
US$ 27.99
US$ 59.99
US$ 129.99
US$ 397.50
US$ 24.99