syenite

enUK

sy·e·nite

C0832100 (sī′ə-nīt′)n. An igneous rock composed primarily of alkali feldspar together with other minerals, such as hornblende.

[Latin Syēnītēs (lapis), (stone) of Syene, from Syēnē, Syene, an ancient city of southern Egypt, from Greek Suēnē.]

sy′e·nit′ic (-nĭt′ĭk) adj.

syenite

(ˈsaɪəˌnaɪt) n (Geological Science) a light-coloured coarse-grained plutonic igneous rock consisting of feldspars with hornblende or biotite[C18: from French syénite, from Latin syēnītēs lapis stone from Syene (Aswan), where it was originally quarried] syenitic adj

sy•e•nite

(ˈsaɪ əˌnaɪt)

n. a granular igneous rock consisting chiefly of orthoclase and oligoclase. [1790–1800; < Latin syēnītēs (lapis) (stone) of Syene] sy`e•nit′ic (-ˈnɪt ɪk) adj.

Translations

syénite

syenite

enUK

syenite

(sī`ənīt), coarse-grained igneous rockrock,
aggregation of solid matter composed of one or more of the minerals forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided, according to their origin, into three major classes—igneous, sedimentary, and metamorphic.
..... Click the link for more information. , similar in appearance and composition to granite. Unlike granite, it contains little or no quartz. The chief minerals in syenite are the feldspars, with mica, hornblende, and pyroxene. Varieties are distinguished (according to the ferromagnesian minerals contained) as augite syenite, hornblende syenite, mica syenite, and nepheline syenite. Syenites are comparatively rare rocks, being found chiefly in a few areas of the United States and Germany. They are occasionally substituted for granites as building stones.

Syenite

a holocrystalline plutonic rock composed chiefly of orthoclase and plagioclase, with admixtures of the following ferrous minerals: hornblende, biotite, pyroxene, and, occasionally olivine. Quartz is also sometimes present.

Depending on the content of ferrous minerals, syenite is classified as hornblende syenite, micaceous syenite, quartz syenite, and so forth. Syenite is characterized chemically by a silica content of 55 to 65 percent; the alkali content determines the classification of syenite into normal and alkali types. In normal syenites plagioclases are present as oligoclase and andesite. Alkali syenites contain orthoclase and, more rarely, albite. Nephelines or other feldspathoids, such as leucite and the so-dalite group of minerals, are formed when the alkali content exceeds 12 percent and the silica content is reduced; alkali syenites thus grade into nepheline syenites or other feldspathoid syenites. Monzonites or gabbro syenites are similar to syenites. They are composed of labradorite and orthoclase with admixtures of ferrous minerals, such as pyroxene.

In the USSR, syenites are abundant in the southern Ukraine (Volyn’ Oblast), the Urals, Kazakhstan, the Caucasus, and Middle Asia, where monzonites are found. Syenites are used for the same purposes as granites.

syenite

[′sī·ə‚nīt] (petrology) A visibly crystalline plutonic rock with granular texture composed largely of alkali feldspar, with subordinate plagioclose and mafic minerals; the intrusive equivalent of trachyte.

单词	syenite
释义	syenite enUK sy·e·nite C0832100 (sī′ə-nīt′)n. An igneous rock composed primarily of alkali feldspar together with other minerals, such as hornblende. [Latin Syēnītēs (lapis), (stone) of Syene, from Syēnē, Syene, an ancient city of southern Egypt, from Greek Suēnē.] sy′e·nit′ic (-nĭt′ĭk) adj. syenite (ˈsaɪəˌnaɪt) n (Geological Science) a light-coloured coarse-grained plutonic igneous rock consisting of feldspars with hornblende or biotite[C18: from French syénite, from Latin syēnītēs lapis stone from Syene (Aswan), where it was originally quarried] syenitic adj sy•e•nite (ˈsaɪ əˌnaɪt) n. a granular igneous rock consisting chiefly of orthoclase and oligoclase. [1790–1800; < Latin syēnītēs (lapis) (stone) of Syene] sy`e•nit′ic (-ˈnɪt ɪk) adj. Translations syénite syenite enUK syenite (sī`ənīt), coarse-grained igneous rockrock, aggregation of solid matter composed of one or more of the minerals forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided, according to their origin, into three major classes—igneous, sedimentary, and metamorphic. ..... Click the link for more information. , similar in appearance and composition to granite. Unlike granite, it contains little or no quartz. The chief minerals in syenite are the feldspars, with mica, hornblende, and pyroxene. Varieties are distinguished (according to the ferromagnesian minerals contained) as augite syenite, hornblende syenite, mica syenite, and nepheline syenite. Syenites are comparatively rare rocks, being found chiefly in a few areas of the United States and Germany. They are occasionally substituted for granites as building stones. Syenite a holocrystalline plutonic rock composed chiefly of orthoclase and plagioclase, with admixtures of the following ferrous minerals: hornblende, biotite, pyroxene, and, occasionally olivine. Quartz is also sometimes present. Depending on the content of ferrous minerals, syenite is classified as hornblende syenite, micaceous syenite, quartz syenite, and so forth. Syenite is characterized chemically by a silica content of 55 to 65 percent; the alkali content determines the classification of syenite into normal and alkali types. In normal syenites plagioclases are present as oligoclase and andesite. Alkali syenites contain orthoclase and, more rarely, albite. Nephelines or other feldspathoids, such as leucite and the so-dalite group of minerals, are formed when the alkali content exceeds 12 percent and the silica content is reduced; alkali syenites thus grade into nepheline syenites or other feldspathoid syenites. Monzonites or gabbro syenites are similar to syenites. They are composed of labradorite and orthoclase with admixtures of ferrous minerals, such as pyroxene. In the USSR, syenites are abundant in the southern Ukraine (Volyn’ Oblast), the Urals, Kazakhstan, the Caucasus, and Middle Asia, where monzonites are found. Syenites are used for the same purposes as granites. syenite [′sī·ə‚nīt] (petrology) A visibly crystalline plutonic rock with granular texture composed largely of alkali feldspar, with subordinate plagioclose and mafic minerals; the intrusive equivalent of trachyte.
随便看	dnd dnd3 dnda dndc dnd/cf dnd cio dndd dnde dndf dndg dndi dn (disambiguation) dndo dndp dndr dndrn dndrp dnds dndx dne dnea dneb dnec dnecl dned