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Main jade producing countries. Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments.Jade is often referred to by either of two different silicate mineral names: nephrite (a silicate of calcium and magnesium in the amphibole group of minerals), or jadeite (a silicate of sodium and aluminum in the pyroxene group of minerals). [1]
Jadeite is presumed one of the most precious materials of Pre-Columbian Costa Rica. It, along with other similar-looking greenstones (e.g. chalcedony, serpentine, and green jasper) were cherished and worked for years. Jadeite was used to decorate the body and was presumably a symbol of power.
Magatama first appeared in Japan in the Final Jōmon period (1000–300 BCE), and in this period were made from relatively simple, naturally occurring materials, including clay, talc, slate, quartz, gneiss, jadeite, nephrite, and serpentinite. [2]
However, in 1952, the first documented discovery of in-situ jadeite in a pre-Columbian Maya jadeite quarry was made by Robert E. Leslie in the Motagua River valley near Manzanal, Guatemala, as documented in a 1955 publication co-authored by Leslie with William F. Foshag, who, at the time, was Head Curator of the Smithsonian Institution ...
Jadeitite consists almost entirely of the pyroxene mineral jadeite and is typically mined as a source of the ornamental rock or gemstone, jade. Occurrences include Myanmar , Guatemala , Japan , Kazakhstan and in the Coast Ranges of western North America.
Jadeite is a pyroxene mineral with composition Na Al Si 2 O 6. It is hard ( Mohs hardness of about 6.5 to 7.0), very tough, and dense, with a specific gravity of about 3.4. It is found in a wide range of colors, but is most often found in shades of green or white.
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