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Nephrite jade : ウィキペディア英語版
Jade

Jade is an ornamental rock.
The term ''jade'' is applied to two different metamorphic rocks that are made up of different silicate minerals:
*Nephrite consists of a microcrystalline interlocking fibrous matrix of the calcium, magnesium-iron rich amphibole mineral series tremolite (calcium-magnesium)-ferroactinolite (calcium-magnesium-iron). The middle member of this series with an intermediate composition is called actinolite (the silky fibrous mineral form is one form of asbestos). The higher the iron content, the greener the colour.
*Jadeite is a sodium- and aluminium-rich pyroxene. The gem form of the mineral is a microcrystalline interlocking crystal matrix.
==Etymology==
The English word ''jade'' is derived (via French ''l'ejade'' and Latin ''ilia'' "flanks, kidney area") from the Spanish term ''piedra de ijada'' (first recorded in 1565) or "loin stone", from its reputed efficacy in curing ailments of the loins and kidneys. ''Nephrite'' is derived from ''lapis nephriticus'', the Latin version of the Spanish ''piedra de ijada''.〔Easby, Elizabeth Kennedy. ''Pre-Columbian Jade from Costa Rica''. (1968). André Emmerich Inc., New York〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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