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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 8 ·4H 2 O.It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.
The turquoise gemstone is the namesake for the color. Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (P O 4) 4 (OH) 8 ·4H 2 O. It is rare and valuable in finer grades and has been prized as a gem and ornamental stone for thousands of years owing to its unique ...
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.
Here's why today's turquoise necklaces, earrings and bracelets deserve a space in your closet. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ...
This implicitly puts the value of compounds' other constituents, and the cost of extraction of the element, at zero. For elements whose radiological properties are important, individual isotopes and isomers are listed. The price listing for radioisotopes is not exhaustive.
There's no shortage of interesting, old and rare European coins capable of commanding big money at auction -- but are any actually still in circulation and not being handled by private collectors ...
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