Dunite (/ ˈduːnaɪt, ˈdʌnaɪt /), also known as olivinite (not to be confused with the mineral olivenite), is an intrusive igneous rock of ultramafic composition and with phaneritic (coarse-grained) texture. The mineral assemblage is greater than 90% olivine, with minor amounts of other minerals such as pyroxene, chromite, magnetite, and pyrope.

纯橄榄岩（dunite）是属于 超基性 侵入岩的一种，全部或几乎全部由橄榄石组成（90%-100%），可含少量辉石及其他矿物，但后者含量（0-10%），常含有铬铁矿、磁铁矿、钛铁矿和磁黄铁矿、自然铂等矿物。新鲜的纯橄榄岩常呈橄榄绿、黄绿或褐绿色。

純橄欖岩 （英語： Dunite），也稱為Olivinite，是一種基性深成火成岩，具顯晶（粗粒）結構。 礦物組合超過90%是 橄欖石，還有少量其他礦物比如 輝石 、 鉻鐵礦 、 磁鐵礦 和鎂鋁榴石（pyrope）等。 純橄欖岩和其他 橄欖岩 被認為是約400 km（250 mi）深度以上地幔的主要成分。 純橄欖岩是洋殼產物很少產於在陸殼岩石中。 通常產於蛇綠岩套的底部，在大陸或島弧碰撞（造山運動）期間，從 俯衝帶 的 地幔 岩板被上沖到大陸地殼上，在高山型造山運動的橄欖岩地塊 …

Dunite, light yellowish green, intrusive igneous ultramafic rock that is composed almost entirely of olivine. Dunite usually forms sills (tabular bodies intruded between other rocks) but may also occur as lenses (thin-edged strata) or pipes (funnels, more or less oval in …

Dunite is an intrusive igneous rock of ultramafic composition and with a phaneritic texture. Dunite, also known as olivinite, is known for its coarse-grained texture and almost exclusive composition of the mineral olivine.

2016年1月1日 · Orogenic dunites are common in high-pressure (HP) and ultrahigh-pressure (UHP) metamorphic belts. This paper reviews the origins of orogenic dunites from over 40 localities around the world and identifies three major types: residual dunite, replacive dunite and cumulative dunite.

Dunite is an ultramafic plutonic rock that is composed almost exclusively of olivine. “Ultramafic” means that mafic minerals form more than 90% on the rocks composition. Most common mafic minerals in ultramafic rocks are definitely pyroxenes and olivine (if hornblende is present it is added to pyroxenes).

2023年6月25日 · Dunite is a coarse-grained, pale green to olive-green, ultramafic intrusive igneous rock with more than 90% olivine. It also may have smaller amounts of pyroxene, spinel, pyrope, chromite, and other minerals. This rock is an olivine-rich endmember of the mantle-derived peridotite rocks.

2015年11月13日 · Dunite. Dunite is an intrusive igneous rock that dominantly consists of coarse grains of the pale green mineral olivine. When the rock weathers, however, it typically appears a dull yellowish brown color often referred to as dun.

Dunite originates from the mantle and is a very dense igneous ultra-maffic rock that comes in a rich variety of green colors. Though highly fractured, this piece shows some stunning deep greens that can be found in dunite.