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Turquoise. Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6( PO 4)4( OH)8·4 H 2 O. It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.
Native American jewelry. Native American jewelry refers to items of personal adornment, whether for personal use, sale or as art; examples of which include necklaces, earrings, bracelets, rings and pins, as well as ketohs, wampum, and labrets, made by one of the Indigenous peoples of the United States. Native American jewelry normally reflects ...
On 24 June 2020, a new record for the world's largest rough tanzanite was set after a small-scale miner, Saniniu Laizer, mined two stones of 9.72 kg (21.4 lb) and 5.1 kg (11 lb) and sold them to the Government of Tanzania through Ministry of Mining for TSh 7.74 billion (US$3.35 million) [23] surpassing a record of 16,839 carats (3.37 kg; 7.42 ...
Opal is a hydrated amorphous form of silica (SiO 2 · n H 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur ...
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 v
Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc. Not every state has an official state mineral, rock, stone and/or gemstone, however.
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