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Malachite is a copper carbonate hydroxide mineral, with the formula Cu 2 CO 3 (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 deep, underground spaces, where the water table and hydrothermal fluids provide the means for chemical precipitation.
Taaffeite is a very rare, light violet gemstone, far more rare than a diamond. The gem is named after its discoverer, Austrian geologist Richard Taaffe, who found the first stone in 1945.
Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 hide
Azurite is unstable in open air compared to malachite, and often is pseudomorphically replaced by malachite. This weathering process involves the replacement of some of the carbon dioxide (CO 2) units with water (H 2 O), changing the carbonate:hydroxide ratio of azurite from 1:1 to the 1:2 ratio of malachite: [8]
In February 2007, the world's rarest baseball card sold at auction for $2.3 million. If you think that's totally wild, consider the world's rarest bible, which could net you $25 to $35 million.
Designed by Chinese-Canadian jeweler Anita Mai Tan, this “heavenly” pen is crafted from 18-karat gold and decorated with 1,888 diamonds and rare gemstones, including a 2-billion-year-old ...
Azurmalachite is a mixture of azurite and malachite. [1] It is alternatively called azuromalachite, azurite-malachite and malachite-azurite. [2] Azurmalachite has a distinctive mottled green and blue coloration. It is relatively rare but can sometimes be found above copper deposits.
27. To'ak Chocolate. Cost: $5 per gram and up To’ak Chocolate is the rarest and most valuable in the world. The company sources its cacao from certified Ecuadorian heirloom Nacional cacao pods ...