In Wyoming, corundum has been found in gneiss, pelitic schist, and vermiculite schist. |
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It contains a variety of lithologies including augen gneiss, quartzite, amphibolite, calc-silicate, pelite and marble. |
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Later, other tectonic events created a series of fractures that cut across the grain of the gneiss. |
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The granite contains several inliers of tonalitic gneiss, including the Chikwakwa gneisses. |
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In the early 3rd millennium bc a stone circle comprising thirteen pillars of local gneiss was built with a single large pillar in the centre. |
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Quarzitic gneiss, low-grade metamorphic basic rocks, phyllites and dark chert can be abundant in some layers. |
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The marble also contains thin bands and lenses of gneiss, often in boudinage structure. |
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The three mountainous areas consist of large cores of igneous rocks surrounded by larger areas of metamorphic rocks, mostly schists and gneiss. |
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It includes a variety of rocks, such as basalt, granite, gneiss, quartzite, slate, and schist. |
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Higher, steeper slopes of the Vosges have thin topsoil, with subsoils of weathered gneiss, granite, sandstone, schist, and volcanic sediments. |
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It is composed of gneiss and migmatite that contain minor lenses of schist, marble, phyllite and quartzite. |
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The Borve Series is dominated by varieties of quartzo-feldspathic schist and gneiss, composed mainly of plagioclase, quartz, and biotite. |
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The sample is weakly banded amphibolite-facies gneiss consisting of quartz, plagioclase, biotite and hornblende. |
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These domes are composed of pelitic schists and gneisses folded around a core of K-feldspar granite and granitic gneiss. |
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Corundum occurs as an accessory mineral in some metamorphic rocks, such as mica schist, gneiss, and crystalline limestone. |
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Eventually, along the side of the road, we came across pallets stacked with light brown gneiss tiles. |
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Geochemistry on the augen gneiss showed a Rb enrichment that could betray its peraluminous character. |
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Strongly foliated porphyroblastic politic gneiss forms a selvedge up to 100 m thick in sharp contact with peridotite on the northern margin of the Carratraca massif. |
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Was the first gneiss facade or the marble spoil wall revetted with stucco? |
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Small lithic fragments comprise quartzite, gneiss and ubiquitous andesite. |
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The Archaean Baidrag complex, composed of tonalitic gneiss, granulite and amphibolite, with minor marble and quartzite, has been interpreted as a microcontinental block. |
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During excavation work in gneiss on the NRLA construction site at Amsteg, a small number of clefts containing amianthus have been encountered. |
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The pegmatite strikes in a NE-SW direction, and is contained in the oligoclase gneiss. |
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The image below is of a Franklin sill intruding Archean gneiss NW of Bathurst Inlet. |
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Hydraulically fractured gneiss with hematite, carbonate, quartz, and chlorite infilling. |
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The pastures are almost all on acidic, not very deep soil standing on siliceous substrata of gneiss and micaceous, talcous and clayey schist. |
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In Geirangerfjord there are outcrops of peridotite and serpentinite in the predominant gneiss bedrock. |
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The Racine Showing consists of sphalerite mineralization in a biotite gneiss close to the contact between a siliceous gneiss and a marble. |
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Both are composed of biotite-quartz-feldspar gneiss interbedded with amphibolites. |
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Examples of metamorphic rocks include: marble, serpentinite, quartzite, argillite, slate and gneiss. |
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Every piece of marble, each chunk of quartzite and all gneiss are the products of such changes. |
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The Bavarian Forest, occupying mainly granite and gneiss hills, is divided into two sections by a sharp quartz ridge known as the Pfahl. |
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West of the Nile, quarries for gneiss were opened as mineral exploitation intensified. |
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When analyzed upon the fleet's return to England, however, his treasure turned out to be nothing more than gneiss. |
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The granitic gneiss complex, thought to be Archean in the past, show Permo-Triassic ages. |
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Nowadays, machines exist to re-polish also harder types of natural stones, like gneiss and granites. |
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It seems that the contact between augen gneiss and metasediments represents a strong mechanical anisotropy along which the basal thrust of the Zermatt-Saas zone developed. |
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These gneiss complexes contain Caledonian eclogites that attest to the deep burial of these rocks in the over-thickened crust resulting from the Caledonian orogeny. |
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This area was the source of anorthosite gneiss and the gabbro or diorite gneiss from which many royal statues were carved. |
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Roofs are traditionally constructed from Alpine rocks such as pieces of schist, gneiss or slate. |
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The rock types include garnet-biotite gneiss, amphibolite and both pelitic and psammitic metamorphosed sediments. |
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When the main by-roads were tarred at the end of the fifties and with the widespread use of tractors, this job disappeared and the gneiss is no longer quarried. |
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Geology Type granite-gneiss and retrograde granulite gneiss with minor amounts of granite and granodiorite. |
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All the gneiss roofing slates have vanished, to be replaced by pantiles painting patchworks of all possible orange hues. |
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Whereas in compact gneiss the tunnel can be advanced and supported simultaneously, in poor rock every metre that is blasted or bored has to be supported immediately. |
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Flake graphite occurs disseminated in marble and gneiss. |
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Quartz sand that is recently weathered from granite or gneiss quartz crystals will be angular. |
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This metamorphic rock, called granitic gneiss, was formed at high pressure in the extremely hot depths of earth then rose to the surface through movements in the earth's crust. |
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The shield consists of several Archean fragments comprising granitic rocks and gneiss laced with sinuous greenstone volcanic belts and broader tracts of sedimentary rocks. |
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In a general way, from S to N, the geology of the tunnel is made of biotite and garnet bearing quartz-feldspar grey gneiss, cut by white and pink pegmatites, a diorite and a sequence of amphibolite gneiss and paragneiss. |
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The area has significant exposures of Archaean gneiss. |
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The mineralization is basically formed of sphalerite, galena, chalcopyrite in a marble level or an anthophyllitecordylite-gahnite gneiss associated to sillimanite nodules gneiss and quartzic gneiss. |
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The basement rock of the region, which is part of the Canadian Shield, is mainly comprised of granite, granitic gneiss and migmatites, often cut by pegmatite intrusions. |
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The basement of Hole AU4-1 consists predominantly of quartzite with minor intervals of arkosic quartzite, semipelitic gneiss and amphibolite. |
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Origin and evolution of Precambrian high-grade gneiss terranes, with special emphasis on the Limpopo complex of Southern Africa. |
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A gneiss has visible bands of differing lightness, with a common example being the granite gneiss. |
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The metamorphic units include micaschist, gneiss, quartzite, marble, greenstone, green schist, lydite, and phyllite. |
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Epidote is found in greenstone belts and many metamorphic rocks such as gneiss and schist, and is hence fairly widespread. |
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The old towns along the route are as solidly built from the gneiss of the region as you might expect. |
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Smaller formations of Lewisian gneiss in the northwest are up to 3 billion years old. |
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It is a common constituent of schist, gneiss, quartzite and other metamorphic rocks. |
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The mountains are composed of granite, gneiss, marble, schists and quartzite. |
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The East Zone target mineralization is related to andesite-diorite porphyry intruded into a basement gneiss and limestone cap on top. |
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All of the remaining samples were comprised of variations of the bulk host lithology of garnetiferrous, biotitic gneiss. |
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With continued increase in metamorphic grade the sequence is phyllite, then schist and finally to gneiss. |
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Monocrystalline quartz grains are usually associated with derivation from granitic gneiss and recrystallised metaquartzite. |
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Bedrock exposed on Vedder Mountain and east of Cultus Lake is made up of thinly layered, dark argillite, and lesser phyllite, gneiss, limestone, and chert. |
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Geologically, the island consists of gneiss and argillaceous schists with occasional tufts and other sedimentary layers from which fossils have been recovered. |
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The Lewisian complex or Lewisian gneiss is a suite of Precambrian metamorphic rocks that outcrop in the northwestern part of Scotland, forming part of the Hebridean Terrane. |
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These are essentially the remains of folded sedimentary rocks that were deposited between 1,000 Ma and 670 Ma over the gneiss on what was then the floor of the Iapetus Ocean. |
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The land is mostly made of hard granite and gneiss rock, but slate, sandstone, and limestone are also common, and the lowest elevations contain marine deposits. |
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Silicate rocks used in this experiment were basalt, dolerite, gneiss, and K-feldspar from Bunbury, Jarrahdale, Northam, and Fort Hedland, Western Australia, respectively. |
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The geology of the regulated outlet area consists of Gabbro and gneiss. |
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I have not the least doubt of such facts occurring, from what I have seen of portions of fine chloritic schists being entangled in the midst of a gneiss district. |
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It includes bedded limestone, dolomite, shale, slate, sandstone, marble, flagstone banded gneiss, massive white to red granite and black anorthsite. |
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