| 单词 | amphibole |
| 例句 | 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 It usually contains roughly-equal amounts of light and dark minerals, including light grains of plagioclase feldspar and dark minerals like amphibole. An Introduction to Geology 2017-01-01T00:00:00Z The dust she’s referring to is toxic amphibole asbestos dust that settled into people’s lungs upon exposure, causing deadly diseases such as lung cancer, asbestosis and mesothelioma. Benefield pushed for justice for Libby asbestos victims 2019-12-01T05:00:00Z A bright green variety of amphibole occurring usually in fibrous or columnar masses. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z 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 How are the silica tetrahedra structured differently in pyroxene and amphibole? Physical Geology 2015-01-01T00:00:00Z The most common amphibole, hornblende, is usually black; however, they come in a variety of colors depending on their chemical composition. An Introduction to Geology 2017-01-01T00:00:00Z 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" HORNBLENDE, an important member of the amphibole group of rock-forming minerals. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 "Home, Daniel" to "Hortensius, Quintus" 2012-03-15T02:00:32.250Z A rock that is dominated by aligned crystals of amphibole. Physical Geology 2015-01-01T00:00:00Z The metamorphic rock, amphibolite, is primarily composed of amphibole minerals. An Introduction to Geology 2017-01-01T00:00:00Z It is a blue fibrous mineral belonging to the amphibole group and closely related to riebeckite; chemically it is an iron sodium silicate. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 6 "Coucy-le-Château" to "Crocodile" In the later stages of alteration the amphibole becomes compact and well crystallized; the rocks consist of green hornblende and plagioclase felspar, and are then generally known as epidiorites or amphibolites. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 3 "Destructors" to "Diameter" 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 blue colour of rock is due to the presence of the amphibole mineral glaucophane. Physical Geology 2015-01-01T00:00:00Z Its essential constituents are felspar, quartz and riebeckite—a soda amphibole. The Project Gutenberg Encyclopedia Volume 1 of 28 Mica-slate, chloritic slate and the rocks of slaty amphibole contain magnetic sand in the tropical regions of Venezuela, as in the most northern regions of Europe. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 3 These lavas, destitute of amphibole and mica, are of a blackish brown, often varying to the deepest olive green. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 Both are common alteration products of magnesian silicate minerals such as olivine, pyroxene, and amphibole. The Economic Aspect of Geology At 15 km to 20 km, larger micas form to produce schist, and at 20 km to 25 km amphibole, feldspar, and quartz form to produce gneiss. Physical Geology 2015-01-01T00:00:00Z 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 It is divided into two shelves, of which the upper presents green steatitous slate mixed with amphibole, and the lower, dark-blue slate, extremely fissile, and traversed by numerous veins of quartz. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 3 This quantity amounts in the basalt of the modern mineralogists only to 0.20, while in amphibole it exceeds 0. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 1 The results of this process are illustrated in Figure 5.10, which shows a granitic rock in which some of the biotite and amphibole have been altered to form the iron oxide mineral limonite. Physical Geology 2015-01-01T00:00:00Z 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 Figure 5.10 A granitic rock containing biotite and amphibole which have been altered near to the rock’s surface to limonite, which is a mixture of iron oxide minerals. Physical Geology 2015-01-01T00:00:00Z We see in them masses of hardened clay, black, fissile, charged with iron, and covered with a crust, yellow from decomposition, like basalts and amphiboles. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 3 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 This effect is especially strong if the new minerals are platy like mica or elongated like amphibole. Physical Geology 2015-01-01T00:00:00Z 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 In the example shown in Figure 7.8d, the dark bands are largely amphibole while the light-coloured bands are feldspar and quartz. Physical Geology 2015-01-01T00:00:00Z It contains no garnet or amphibole, but metalloid diallage disseminated in the mass. Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 3 Similarly, a gneiss that originated as basalt and is dominated by amphibole, is an amphibole gneiss or, more accurately, an amphibolite. Physical Geology 2015-01-01T00:00:00Z Examples of minerals are feldspar, quartz, mica, halite, calcite, and amphibole. Physical Geology 2015-01-01T00:00:00Z 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 |
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