尖晶石

The variety of spinel includes red spinel, ruby color spinel or ruby spinel, purple or spinel similar to the luster of almandine, pink or rosy spinel, reddish spinel, blue spinel, gem color spinel or gem spinel, spinel like alexandrite, black spinel, candite or ceylonite.

尖晶石的种类包括（红色尖晶石、红宝石色的尖晶石或红宝石尖晶石、紫色的或类似贵榴石色泽的尖晶石、粉或玫瑰色尖晶石、桔红色尖晶石、蓝色尖晶石、蓝宝石色尖晶石或蓝宝石尖晶石、象变石的尖晶石、黑色尖晶石、铁镁尖晶石或镁铁尖晶石）。

Since chemical composition and other characteristics are similar, it is quite diffictl to identify spinel from ruby and sapphires with unaided eye, which is the main reason that both gemstones have been confused long time.

尖晶石的呈色机理与红蓝宝石大体相同，化学成分和其他性质也很相似，靠肉眼来识别是不可能的，因此几世纪以来，二者一直混淆不清。不过，没有像黄色蓝宝石那样颜色的黄色尖晶石，因为使黄色蓝宝石至色的铁离子使尖晶石呈浅蓝或蓝绿色。

The ancient world couldn't tell ruby and spinel apart, but spinel's role as an unknown understudy keeps its price relatively low today even though a one-carat red spinel is more rare than a one-carat ruby.

古代世界说不出红宝石、尖晶石遥远，但尖晶石作为未知understudy守信今天虽然价格较低一克拉是红色尖晶石更为难得一比一克拉红宝石。

The 43-57km lithospheric mantle could be consist of a suite of cumulates with crystalloblastic texture, cumulate texture and relic magmatic crystalline textures, such as orthopyroxenite, websterite, clinopyroxenite and olivine-pyroxenite. The lithospheric mantle of 43km to Moho discontinuity could be spinel harzbergite and minor spinel lherzolite, in which the spinel harzbergite and minor spinel lherzolite xenoliths are discoveried. The Moho in the region could be an transitional zone composed of cumulates in petrology.

它既包括了具变晶结构的斜方辉石岩、二辉石岩，又包括了具有残留岩浆结晶结构与堆积结构的橄辉岩和辉石岩；向上至莫霍面，应为尖晶石方辉橄榄岩，并有少量尖晶石二辉橄榄岩，本区发现的尖晶石二辉橄榄岩(T7-21)和尖晶石方辉橄榄岩(T35、T58)可能来自该层；本区莫霍面在岩石学上可能为一个由堆积岩组成的过渡带(3～5km)。

Spinel lherzolites vary from 850°to 1050℃. The number of spinel lherzolite sample increases at 850℃ and decreases at 1050℃ sharply. The rarity of spinel lherzolite between 900° 950℃ has a particular significance. Spinel-garnet lherzolites have higher temperatures (1050° 1100℃) than the spinel lherzolites.

尖晶石二辉橄榄岩的平衡温度主要介于850°-1050℃之间，850℃和1050℃分别代表了尖晶石二辉橄榄岩的数量剧增和锐减的两个温度界线，900°-950℃之间的尖晶石二辉橄榄岩的缺乏具有特殊的意义；尖晶石-石榴子石二辉橄榄岩的平衡温度介于1050°-1100℃之间。

The spinel-garnet lherzolites locate at the depth about 60 km, right in the transition from spinel lherzolite to garnet lherzolite.

上地幔则以尖晶石二辉橄榄岩为主，在其接近莫霍面的42-45km处存在尖晶石辉石岩层，在55-65km之间则存在石榴子石辉石岩层，尖晶石-石榴子石二辉橄榄岩出现于60km处。

Magnesia alumina spinel brick is based on high-purity magnesia and synthetic magnesia alumina spinel with major crystal phase of periclase and spinel. By intensively mixed, double-face pressed and fired at high temperature. Being completely chrome free, it is the ideal refractory for the transitional zone of cement kiln characterized by superior thermal shock resistance, good anti-erosion capacity, and lower thermal conductivity.

此次展会为您展出的水泥回转窑用镁铝尖晶石砖以高纯镁砂和合成镁铝尖晶石砂为主要原料，主晶相为方镁石和尖晶石，经过强力混练，双面加压，高温烧成等工艺制成，是水泥窑过渡带的标准耐火材料，具有无铬污染，热震稳定性好，耐磨损，抗侵蚀性强，热导率低等特点。

The deep-seated xenoliths entrained by the Cenozoic Hannuoba basalts can be divided into three groups according to their mineral assemblages:Ⅰ Granulites, including felsic granulites, noritic granulites, and dominantly, two-pyroxene granulites,Ⅱ Pyroxenites, including websterites, spinel pyroxenites, and garnet pyroxenites;Ⅲ Peridotites, including spinel lherzolites and spinelgarnet lherzolites.

根据新生代汉诺坝玄武岩中深源岩石捕掳体的矿物组合类型，将其分为主要的三大类：麻粒岩类中包括长英质麻粒岩、苏长质麻粒岩和二辉麻粒岩，辉石岩类包括二辉石岩、尖晶石辉石岩和石榴子石辉石岩，橄榄岩类则包括尖晶石二辉橄榄岩和尖晶石-石榴子石二辉橄榄岩。

Some basic theories and principles of spinel formation and the basic technology and process of industrial production of spinel minerals are described. The development and application of raw minerals and products of spinels are also briefly introduced.

笔者根据尖晶石的矿物学特性，对尖晶石的生成以及工业生产的基本原理、基本工艺和基本过程作一系统的概述，并对尖晶石原料、含尖晶石工业制品的开发与应用作一简要的介绍。

Spinel is a compound of magnesia and alumina(Al2O3) and is thus a magnesium aluminate(MgAl2O4), found as accessories in igneous rocks, in metamorphosed aluminous schists, in contact metamorphosed limestones and sometimes in high temperature iore veins.

尖晶石主要成分是氧化镁和氧化铝，结晶习性是等轴晶系漂亮的正八面体。镁被铁置换就是铁尖晶石，被锌置换就是锌尖晶石，铁完全置换镁形成磁铁矿，铬置换铁尖晶石形成铬铁矿，这些类质同相的等轴晶系都是八面体结晶的尖晶石族矿物。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。