nephrite
/nef"ruyt/, n.
Mineral. a compact or fibrous variety of actinolite, varying from whitish to dark green: a form of jade.
[1785-95; < G Nephrit. See NEPHR-, -ITE1]

* * *

Gem-quality, usually green silicate mineral in the tremolite-actinolite-ferrotremolite series of amphiboles.

It is the less prized but more common of the two types of jade and may be distinguished from jadeite by its splintery fracture and oily lustre. Nephrite occurs in low-grade (formed under low-temperature, low-pressure conditions), regionally metamorphosed rocks. Important deposits occur in China, Siberia, New Zealand, Switzerland, Alaska, and Wyoming.

* * *

      a gem-quality silicate mineral in the tremolite–actinolite series of amphiboles. It is the less prized but more common of the two types of jade, usually found as translucent to opaque, compact, dense aggregates of finely interfelted tufts of long, thin fibres. It may be distinguished from jadeite (q.v.), jade's other form, by its splintery fracture and oily lustre. Ordinarily coloured green, nephrite is commonly mottled or flecked with dark inclusions.

      Nephrite occurs in low-grade, regionally metamorphosed rocks. China's most important source of nephrite throughout history has been the region of Khotan (Ho-t'ien) and Yarkand in central Asia. Other important sources include the Lake Baikal area, Siberia; South Island, New Zealand; near Kotzebue, Alaska; along the Sweetwater River, Wyoming; and the canton of Graubünden, Switzerland. Great boulders of nephrite have been found near Jordanów (Jordansmühl) in Silesia, Poland, and in the valleys of the Turnagain and Fraser rivers in British Columbia. Nephrite was found in 1960 at Mashaba, Rhodesia, the first find on the African continent. In 1965 the mineral was found near Hualien, Taiwan (Formosa).

* * *


Universalium. 2010.

Look at other dictionaries:

  • Nephrite — Néphrite (minéral) Pour l affection du rein, voir : Néphrite. Néphrite Catégorie IX : silicates …   Wikipédia en Français

  • néphrite — 1. (né fri t ) s. f. Terme de médecine. Inflammation des reins. ÉTYMOLOGIE    Terme grec signifiant rein, et la finale médicale ite, indiquant inflammation. néphrite 2. (né fri t ) s. f. Terme de minéralogie. Néphrite d Orient, variété du jade… …   Dictionnaire de la Langue Française d'Émile Littré

  • nephrite — eph rite (?; 277), n. [Cf. F. n[ e]phrite. See {nephritis}.] (Min.) A hard compact mineral, of a dark green color, formerly worn as a remedy for diseases of the kidneys, whence its name; kidney stone; a kind of jade. It varies in color from white …   The Collaborative International Dictionary of English

  • nephrite — [nef′rīt΄] n. [Ger nephrit < Gr nephritēs, of the kidneys < nephros, kidney (see NEPHRO ): formerly worn as a supposed remedy for kidney ailments] a fine grained, greenish variety of actinolite, that is a less valuable type of jade …   English World dictionary

  • néphrite — 1. néphrite [ nefrit ] n. f. • 1802; néphrésie 1557; gr. nephritis (nosos) « (maladie) des reins » ♦ Maladie inflammatoire et douloureuse du rein. Néphrite aiguë. Néphrite chronique. Adj. NÉPHRITIQUE . néphrite 2. néphrite [ nefrit ] n. f. •… …   Encyclopédie Universelle

  • Nephrite — This article is about the gemstone. For the fictional character, see Nephrite (character). Not to be confused with Nephritis. Nephrite Nephrite from Jordanów Śląski (Poland) General …   Wikipedia

  • Néphrite — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Néphrite peut désigner : la néphrite, une inflammation du rein ; la néphrite, une variété de trémolite verte composant le Jade. Sur les autres… …   Wikipédia en Français

  • nephrite — nefritas statusas T sritis chemija apibrėžtis Aktinolito atmaina, mineralas. formulė Ca₂(Mg,Fe)₅[(OH,F)|Si₄O₁₁]₂ atitikmenys: angl. nephrite rus. нефрит …   Chemijos terminų aiškinamasis žodynas

  • nephrite — noun Etymology: German Nephrit, from Greek nephros; from its formerly being worn as a remedy for kidney diseases Date: 1794 a compact tremolite or actinolite that is the commoner and less valuable kind of jade and that varies in color from white… …   New Collegiate Dictionary

  • NÉPHRITE — n. f. T. de Médecine Inflammation du rein …   Dictionnaire de l'Academie Francaise, 8eme edition (1935)

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”