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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.
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, “Jadite” or “Jade-ite” is a type of jade green opaque milk glass, originally popular in the United States in the early to mid-20th century. A blue milk glass called “Delphite” (Delfite, Jeannette Glass) and "Azur-ite" (Anchor Hocking) was also produced for several years.
The name nephrite is derived from the Latin lapis nephriticus, which in turn is derived from the Ancient Greek λίθος νεφριτικός (líthos nephritikós) or νεφρός λίθος (nephrós líthos), which means "kidney stone" and is the Latin and Greek version of the Spanish piedra de ijada (the origin of jade and jadeite). [3]
It is composed of several different minerals, including kosmochlor (also known as ureyite), varying amounts of chromium-enriched jadeite, and albite feldspar. [2] Maw sit sit can have a refractive index ranging from 1.52-1.68, [3] [4] and a hardness rating of 6 to 7 on the Mohs scale. Maw sit sit has a specific gravity ranging from 2.45 to 3.15 ...
Oracle bone script for 玉 "jade".. The Chinese word yù 玉 "jade; gems of all kinds; (of women) beautiful; (courteous) your" has semantically broader meanings than English jade "any of various hard greenish gems used in jewelry and artistic carvings, including jadeite and nephrite; a green color of medium hue; made of jade; green like jade".
A Neolithic polished jadeitite axe head found at Colomiers in southern France. Jadeitite is a metamorphic rock found in blueschist-grade metamorphic terranes.It is found in isolated metasomatically altered rock units within serpentinite associated with subduction zone environments.
Mere are between 25 and 50 centimetres (10 and 20 in), with an average length of 35 centimetres (14 in). The width of a mere is similarly variable, from under 7 to over 12 centimetres (3 to 5 in). The dimensions of a mere were generally determined by the characteristics of the raw materials the club was made from. [2]