| 单词 | pyroxene |
| 例句 | However, in those cases they had been more complex, magnesium-rich crystals of olivine and pyroxene. JWST Detects Quartz Crystals in an Exoplanet’s Atmosphere 2023-10-20T04:00:00Z Measurements from orbit show the material is loaded with pyroxenes, minerals common in volcanic lava. Volcanic Activity on Mars Upends Red Planet Assumptions 2023-03-22T04:00:00Z Measurements from orbit show the material is loaded with pyroxene, a mineral associated with explosive volcanic events called pyroclastic flows. Volcanic Activity on Mars Upends Red Planet Assumptions 2023-01-05T05:00:00Z This water is mostly derived from alteration of pyroxene and olivine to serpentine near the spreading ridge shortly after the rock’s formation. Physical Geology 2015-01-01T00:00:00Z It is mostly made of dark minerals like pyroxene and olivine, which are rich in iron and magnesium and relatively poor in silica. An Introduction to Geology 2017-01-01T00:00:00Z Maaz, which is on top and thus probably younger, has a composition similar to most basaltic lava flows — full of minerals known as pyroxene and plagioclase but with little or no olivine. NASA sees ‘otherworldly’ wreckage on Mars with ingenuity helicopter 2022-04-28T04:00:00Z Séítah rocks contained evenly distributed crystals of the mineral olivine, which coalesce as magma slowly cools, whereas Máaz rocks had small grains of pyroxene and plagioclase, interlocked in a way that indicated igneous formation. Mars rover wraps survey of Jezero crater’s surprising volcanic floor 2022-03-09T05:00:00Z Made of minerals such as olivine and pyroxene, and sometimes glass, chondrules themselves come in a variety of shapes, sizes and compositions—often containing a glittering array of crystals. Asteroid Dust from Hayabusa2 Could Solve a Mystery of Planet Creation 2020-12-08T05:00:00Z In amphibole structures, the silica tetrahedra are linked in a double chain that has an oxygen-to- silicon ratio lower than that of pyroxene, and hence still fewer cations are necessary to balance the charge. Physical Geology 2015-01-01T00:00:00Z Ultramafic refers to the extremely mafic rocks composed of mostly olivine and some pyroxene which have even more magnesium and iron and even less silica. An Introduction to Geology 2017-01-01T00:00:00Z After discovering the fragments in the spring of 2019, scientists observed them further and found they contained traces of the mineral pyroxene, found on Vesta. NASA finds parts of another asteroid on asteroid Bennu 2020-09-22T04:00:00Z It contains lots of pyroxene, olivine and feldspar minerals. Martian meteorite to head home to Red Planet 2020-07-25T04:00:00Z The ubiquitous pyroxene group features a three-to-two mix of oxygen with common metal elements like magnesium, iron and calcium. Why Carbon? 2019-10-22T04:00:00Z How are the silica tetrahedra structured differently in pyroxene and amphibole? Physical Geology 2015-01-01T00:00:00Z Olivine and pyroxene are rarely found as end products of weathering because they tend to break down into elemental ions. An Introduction to Geology 2017-01-01T00:00:00Z “Then, when the parent asteroid was catastrophically disrupted, a portion of its debris accumulated under its own gravity into Bennu, including some of the pyroxene from Vesta.” NASA finds parts of another asteroid on asteroid Bennu 2020-09-22T04:00:00Z Backlit under a microscope, minerals in the slices—including plagioclase, olivine, and pyroxene—burst into focus: polygonal islands swimming in a dark sea of rock. Smudged volcanic crystals offer clues to past eruptions 2016-11-17T05:00:00Z Dark, angular crystals of pyroxene floated alongside white, chunky feldspars. Feature: A castaway from ancient Mars 2014-11-25T05:00:00Z At about the point where pyroxene begins to crystallize, plagioclase feldspar also begins to crystallize. Physical Geology 2015-01-01T00:00:00Z Two other similar arrangements of tetrahedra are close in structure to the neosilicates and grade toward the next group of minerals, the pyroxenes. An Introduction to Geology 2017-01-01T00:00:00Z An X-ray analysis by CheMin showed that the ground-up rock comprised mostly igneous minerals such as feldspar, pyroxene, olivine and magnetite. Mars Rover Finds Evidence of Ancient Habitability 2013-03-13T19:45:00.600Z In the slices most of the colored bits are either full or fragmented chondrules or they are grains of olivine or pyroxene that were released from chondrules that broke open. Fall That Glitters: Microscopy Reveals Stained-Glass Beauty in Ancient Meteorites [Slide Show] 2013-01-23T13:15:00.190Z Humayun’s team analyzed rock pieces rich in pyroxene and feldspar—minerals that would have been among the first to settle out of a cooling magma chamber. Feature: A castaway from ancient Mars 2014-11-25T05:00:00Z As the temperature continues to drop, olivine becomes unstable while pyroxene becomes stable. Physical Geology 2015-01-01T00:00:00Z Members of the pyroxene family have a complex chemical composition that includes iron, magnesium, aluminum, and other elements bonded to polymerized silica tetrahedra. An Introduction to Geology 2017-01-01T00:00:00Z The team says the sample contains "significant amounts" of the minerals feldspar, olivine and pyroxene. Martian soil sample 'like Hawaii' 2012-10-31T11:10:03Z These fluids contain all the components that have not been consumed in the high-temperature crystals like pyroxene, olivine and plagioclase; and among these components, of course, there is water. Pacific lavas back dry early Mars 2012-09-10T08:50:04Z The lava is black, rich in pyroxene, and strongly attracted by a magnet. The Catholic World; Volume I, Issues 1-6 A Monthly Eclectic Magazine 2012-04-05T02:00:40.207Z As it cools further, much of the remaining silica goes into calcium-rich plagioclase, and any silica left may be used to convert some of the olivine to pyroxene. Physical Geology 2015-01-01T00:00:00Z In section 1, olivine crystallizes; section 2: olivine and pyroxene crystallize; section 3: pyroxene and plagioclase crystallize; and section 4: plagioclase crystallizes. An Introduction to Geology 2017-01-01T00:00:00Z A variety of pyroxene, usually of a black or dark green color, occurring in igneous rocks, such as basalt; Ð also used instead of the general term pyroxene. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z It is now applied to the dark-coloured aluminous members of the monoclinic amphiboles, occupying in this group the same position that augite occupies in the pyroxene group. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z Around the garnets there is often a radial grouping of small grains of pyroxene and hornblende in a clear matrix of felspar: these “centric” structures are frequent in granulites. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z The upper mantle is typically composed of peridotite, a rock dominated by olivine and pyroxene. Physical Geology 2015-01-01T00:00:00Z Imagine two pyroxene chains that connect together by sharing the third oxygen on each tetrahedron. An Introduction to Geology 2017-01-01T00:00:00Z A mineral occurring in triclinic crystals approaching pyroxene in angle, and of a greenish black color.It is a silicate of iron, manganese, and lime. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z Segregations of iron ores, such as ilmenite, usually with pyroxene or olivine, occur in association with some gabbro and anorthosite masses. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z Their essential minerals are pyroxene, plagioclase and garnet: chemically they resemble the gabbros. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z These include minerals such as quartz, feldspar, mica, amphibole, pyroxene, olivine, and a great variety of clay minerals. Physical Geology 2015-01-01T00:00:00Z Diop�side, a calcium magnesium silicate, of the pyroxene series, occurring in igneous rocks and altered limestones, with a vitreous lustre, and of a pale-green, or a greenish- or yellowish-white colour. The New Gresham Encyclopedia Volume 4, Part 1: Deposition to Eberswalde 2011-04-14T02:00:57.977Z Augite or pyroxene is a black or greenish-black mineral, found, either as crystals, which are generally small, or as rounded grains and angular fragments, in basaltic and volcanic rocks. Geology 2011-02-20T03:00:12.660Z In these the minerals have a parallel arrangement, the felspars are often broken down by pressure into a mosaic of irregular grains, while greenish fibrous or bladed amphibole takes the place of pyroxene and olivine. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z The asbestos formerly used in the arts was generally a fibrous form of some kind of amphibole, like tremolite, or anthophyllite, though occasionally perhaps a pyroxene. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 7 "Arundel, Thomas" to "Athens" In pyroxene, silica tetrahedra are linked together in a single chain, where one oxygen ion from each tetrahedron is shared with the adjacent tetrahedron, hence there are fewer oxygens in the structure. Physical Geology 2015-01-01T00:00:00Z Both Great and Little Ararat consist entirely of volcanic rocks, chiefly andesites and pyroxene andesites, with some obsidian. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 4 "Aram, Eugene" to "Arcueil" They contain a small amount of quartz, and often micropegmatite, as the last element to consolidate, filling up little angular interspaces between the felspars and pyroxenes, which had previously crystallized. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 "Dodwell" to "Drama" Diopside is the characteristic pyroxene of metamorphic rocks, occurring especially in crystalline limestones, and often in association with garnet and epidote. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" The other minerals found in the concentrates are pebbles and fragments of pyrope, zircon, cyanite, chrome-diopside, enstatite, a green pyroxene, mica, ilmenite, magnetite, chromite, hornblende, olivine, barytes, calcite and pyrites. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" The structure of pyroxene is more “permissive” than that of olivine — meaning that cations with a wider range of ionic radii can fit into it. Physical Geology 2015-01-01T00:00:00Z Serpentine, which may be fibrous or scaly, is a secondary product of olivine and certain pyroxenes. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" Diallage is in fact an altered form of these varieties of pyroxene; the particular kind of alteration which they have undergone being known as "schillerization." Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3 "Destructors" to "Diameter" It is also an essential constituent of some pyroxene-granites, diorites and a few other igneous rocks, but the characteristic pyroxene of this class of rocks is augite. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5 "Dinard" to "Dodsworth" The original home of platinum is in basic igneous rocks, such as peridotites, pyroxenites, and dunites, where it has been found in small, scattered crystals intergrown with olivine, pyroxene, and chromite. The Economic Aspect of Geology Amphibole is even more permissive than pyroxene and its compositions can be very complex. Physical Geology 2015-01-01T00:00:00Z Its prevalence is due to the unstable composition of the original minerals of the rock, such as olivine, hypersthene, and pyroxene. History and Comprehensive Description of Loudoun County, Virginia Where diabases have been crushed or sheared, hornblende readily develops at the expense of pyroxene, sometimes replacing it completely. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3 "Destructors" to "Diameter" "And not a trace of cleavable pyroxene," said he. Punchinello, Volume 1, No. 20, August 13, 1870 In these occurrences the tungsten mineral is almost invariably scheelite, and is associated with calcite, garnet, pyroxene, and other silicates. The Economic Aspect of Geology To be more specific, felsic rocks typically have biotite and/or amphibole; intermediate rocks have amphibole and, in some cases, pyroxene; and mafic rocks have pyroxene and, in some cases, olivine. Physical Geology 2015-01-01T00:00:00Z Minerals present are hornblende, biotite, plagioclase, pyroxene, quartz and the alteration products from the feldspar. The Long Labrador Trail DIALLAGE, an important mineral of the pyroxene group, distinguished by its thin foliated structure and bronzy lustre. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3 "Destructors" to "Diameter" Most of them contained crystals of felspar and pyroxene. To the Gold Coast for Gold A Personal Narrative in Two Volumes.—Volume I Like talc, they are derived principally from the alteration of olivine, pyroxene, and amphibole,—or more commonly from serpentine, which itself results from the alteration of these minerals. The Economic Aspect of Geology The early-forming olivine crystals react with silica in the remaining liquid magma and are converted into pyroxene, something like this: Physical Geology 2015-01-01T00:00:00Z A coarse dark green rock whose principal constituents are pyroxene plagioclase and magnetite. The Long Labrador Trail Crystalline pyroxene and crystallized sulphates of lime apparently abound, while the same is the case with carbonate of manganese, and other forms of the metal so common in Western Sinai. The Land of Midian — Volume 1 I found no real basalt or dolerite; but the presence of pyroxene in the amygdaloid of Parapara leaves little doubt of the igneous origin of those spheroidal masses, fissured, and full of cavities. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 It is supposed to have formed by the alteration of olivine and pyroxene in the igneous rocks. The Economic Aspect of Geology For example, pyroxene can be converted to the clay minerals chlorite or smectite, and olivine can be converted to the clay mineral serpentine. Physical Geology 2015-01-01T00:00:00Z There is also a small amount of hematite, pyroxene and sericite. The Long Labrador Trail I have found in it neither amphibole nor pyroxene, but some small white points, which seem to be feldspar. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 I did not see there any pyroxene; but on the very spot I recognized a number of crystals in the amygdaloid, which appears so strongly linked to the grunstein that they alternate several times. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 Both are common alteration products of magnesian silicate minerals such as olivine, pyroxene, and amphibole. The Economic Aspect of Geology The equation shown here is for olivine, but it could apply to almost any other ferromagnesian silicate, including pyroxene, amphibole, or biotite. Physical Geology 2015-01-01T00:00:00Z The principal minerals are, plagioclase, biotite and microcline, with smaller quantities of quartz, iron oxide, pyroxene and garnet. The Long Labrador Trail Others are amphiboles, pyroxenes, zeolites, garnets and many others you may never find or hear about unless you become a true mineralogist. Let's Collect Rocks and Shells Their nucleus is almost as hard as basalt, and they are intermingled with little cavities, owing to bubbles of gas, filled with green earth, and crystals of pyroxene and mesotype. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 This young scientist, too, cherished loving thoughts about Angelina, thoughts of a more earthly and volcanic tinge; certain definite projects which made him forget, at times, his preoccupation with biotite, perlite, magnetite, anorthite, and pyroxene. South Wind The passage of this water through the oceanic crust at 200° to 300°C promotes metamorphic reactions that change the original pyroxene in the rock to chlorite and serpentine. Physical Geology 2015-01-01T00:00:00Z He discovered that each crystal of pyroxene, enveloped in the earthy mass, is separated from it by fissures parallel to the sides of the crystal. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 |
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