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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. Jadeite is formed only in the subduction zones of continental margins, where rock ...
Magatama. Magatama (勾玉, less frequently 曲玉) are curved, comma -shaped beads that appeared in prehistoric Japan from the Final Jōmon period through the Kofun period, approximately 1000 BCE to the 6th century CE. [1] The beads, also described as "jewels", were made of primitive stone and earthen materials in the early period, but by the ...
Colloquially 'jade' objects in Mesoamerica are composed of jadeite, but may also refer to other similar-looking, relatively hard greenstones such as albitite, omphacite, chrysoprase, and quartzite. [3] Variation in color is largely due to variation in trace element composition. In other words, the types of trace elements and their quantities ...
Costa Rican jade tradition. 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.
Jade. 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 ...
A large quantity of artifacts was discovered in the settlement area, including cylindrical and round beads made of tuff, jadeite and other materials, magatama, stone axes, clay figurines, spindle wheels and earthenware pottery shards. A great interest was a number of bowl-shaped pottery used for pottery pots known as "Onga River type", which ...
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