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Showing 1 to 20 of 197 for “"feldspar"”.
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Solid state diffusion in the feldspar system
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology, 1953.
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The Elastic Behavior of Plagioclase Feldspar at High Pressure
Feldspars are one of the archetypical families of framework silicates. They not only comprise around 60% volumetrically of the Earth's crust, but are among some of the most structurally complicated minerals. Investigation into the structural behavior of various intermediate plagioclases at pressure …
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The recovery of gallium from a Virginia feldspar ore
A method of extracting gallium from a Virginia feldspar has been determined. The steps in this method are: 1. Grinding of the ore to a very small particle size (200 mesh) 2. Extraction of gallium by “leaching” the ore with sodium hydroxide 3. Acidification of the sodium hydroxide solution with …
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The stability of the remnant luminescence emissions of alkali feldspar
Abstract available p. i-ii
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Design and evaluation of alumina/feldspar resin infiltrated dental composite materials
Submitted in fulfillment of the degree of Doctor of Dental Material Science in the Durban University of Technology, Durban, South Africa, 2008.
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The effect of sintering temperature on potassium feldspar addition into claytan porcelain
… materials composed mainly of kaolin, quartz and feldspar. Its diverse applications include tableware, whiteware and insulators. This study was performed to investigate the effects of different sintering temperature on Claytan porcelain with the addition of 0wt%, 2wt%, 4wt%, 6wt%, 8wt% and 10wt% …
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Geology & Geochemistry of the Kingman Feldspar, Rare Metals and Wagon Bow Pegmatites
In the Mojave Pegmatite district, located in northwestern AZ, numerous pegmatites intrude syn- to post-collisional Paleoproterozoic granitic rocks. The slightly older Cerbat plutons are associated with the suturing of the Mojave and Yavapai terranes whereas Aquarius granites were emplaced during …
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Water on Calcite (10.4) and K-Feldspar (001) - Adsorption Structure and Desorption Kinetics -
… mineral surfaces, calcite (10.4) and K-feldspar (001), are investigated. Calcite is the most abundant carbonate mineral in the Earth’s crust. Despite its abundance, a central surface property, the presence of a surface reconstruction, remained elusive so far. Only recently, an atomic …
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Pentlandite-pyroxene and pentlandite-feldspar interactions and their effect on separation by flotation
… the separation of pentlandite from pyroxene and feldspar. The aim was to minimise the percentage pyroxene and feldspar reporting to the concentrate and simultaneously maximise the pentlandite recovery. The possible chemical reactions taking place on surfaces of synthetic pentlandite, natural …
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Development of the porcelain tiles by the partial substitution of feldspar with fly ash
… the multi-cyclone collectors. In this research, feldspar is gradually replaced by fly ash compositions of 0 – 25 wt. %. The samples were mixed for 12 hours, pressed with a load of 3 tonnes and isostatically pressed by using CIP with a pressure of 100 MPa. The samples were sintered at the …
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An Investigation of the Minor Element Content of Potash Feldspar From Pegmatites, Haystack Range, Wyoming
Made available in DSpace on 2014-12-04T19:14:11Z (GMT). No. of bitstreams: 1 6200569.pdf: 2671903 bytes, checksum: d23514ca1db519f515c48d0c5427fea2 (MD5) Previous issue date: 1961
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Feldspar thermal states as an indicator of relative ages in the Mt. Doherty igneous complex.
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968.
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Raman Spectroscopy and Synchrotron X-ray Diffraction Study of Lunar and Terrestrial Plagioclase Feldspar at High-Pressure and High-Temperature Conditions
Plagioclase feldspar is one of the abundant minerals on the surface of the Earth, the Moon and Mars, and is also commonly found in meteorites. This dissertation seeks to better understand the phase changes in plagioclase when subjected to meteorite impact and fundamental information about impact …
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Recent two-feldspar, Ti-in-biotite, and garnet-biotite geothermometry of the Frontenac terrane and Adirondack Lowlands, Grenville Province, Canada and the United States
… we used garnet-biotite, Ti-in-biotite, and two-feldspar geothermometry and we examined the geochemistry of Adirondack Lowlands and Frontenac terrane pelites. Rare-earth elements and trace element concentrations reveal a shale protolith for the Adirondack Lowlands pelites and most likely for the …
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Potassic alteration of Cambrian-Ordovician sandstones and Precambrian basement rocks of the North American midcontinent
… three distinct diagenetic zones: an upper K-feldspar overgrowth zone, an underlying sericite zone, and a lowermost feldspar zone. Uppermost Precambrian basement exhibits potassic alteration similar to the overlying Mt. Simon Sandstone. Sericite in the basement rock was likely formed during …
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Petrology of the Numabin Bay intrusions, Reindeer Lake, Saskatchewan
… biotite; (2) an increase in the percentage of K feldspar; and (3) no consistent variation in the proportion of quartz towards the core of the pluton. Textures and microstructures show that early-formed minerals underwent cataclasis and plagioclase was replaced by K feldspar. Potassium and …
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Statistical analysis and presentation of ball clay tests for low-tension electrical porcelain
… on the compressive strength properties. Since feldspar mainly controls fired shrinkage and fired absorption, and since the same amount of feldspar was used in each body, the effects of using different ball clays on these physical properties were not so pronounced.
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Thermochronology and geobarometry of the Granite Mountains, southeast California: Exhumation of a plutonic complex during collapse of the Sevier orogen
… cooling through 500°C at ∼75 Ma. K-feldspar multi-diffusion domain modeling indicates a cooling rate gradient from SW to NE of 63, 32, and 16°C/Ma for three samples spanning a transect across the range. NE K-feldspar cooled through ∼252°C by 73 Ma while other samples remained …
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An Examination of the Mineralogy and Lithology of the Bakken Shale with Implications upon the Bakken Petroleum System, Southeastern Saskatchewan
… a detrital assemblage mainly comprising quartz, feldspar, mica and heavy minerals; b) detrital clay minerals with minor authigenic clays; c) a mixture of detrital and authigenic carbonate minerals (primarily dolomite and calcite); and d) other minerals of minor abundance (pyrite, sphalerite, …
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Petrology of the Roxboro metagranite, North Carolina
… was plagioclase, quartz, and then K-rich feldspar. A crude approximation of the original plagioclase phenocryst An content ranges between An₂₅ to An₄₀. An estimate of the granophyric composition reveals that the pluton was emplaced under almost "dry" conditions with a P<sub>total</sub> of …
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