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GEOCHEMISTRY OF FELDSPARS AND MUSCOVITE IN …

The Canadian Mineralogist Vol. 41, pp. 103-116 (2003) GEOCHEMISTRY OF FELDSPARS AND MUSCOVITE IN GRANITIC PEGMATITE FROM THE CAP DE CREUS FIELD, CATALONIA, SPAIN PURA ALFONSO§ and JOAN CARLES MELGAREJO Departament de Cristal•lografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona, C/ Martí Franquès s/n, E–08028 Barcelona, Spain

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Degree of Al/Si order in potassium feldspars. A ...

Crosby, P.: Composition and structural state of alkali feldspars from charnockitic rocks on Whiteface Mountain, NewYork. Am. Mineralogist 56, 1788–1811 (1971) Google Scholar Hafner, S., Laves, F.: Ordnung/Unordnung und Ultrarotabsorption. II. Variation der Lage und Intensität einiger Absorptionen von Feldspäten.

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Feldspar mineralogy and rare-earth element (re ...

Background on IOCG deposits and feldspar alteration. Iron oxide copper-gold mineralization forms in a wide range of ore systems spanning the Archean to the Phanerozoic (e.g. Groves et al., Reference Groves, Bierlein, Meinert and Hitzman 2010).Genetic models for these deposits are still much debated, particularly regarding the role of igneous rocks, the sources of metals and fluids, and ...

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R050193 - RRUFF Database: Raman, X-ray, Infrared, and ...

A crystallographer's interpretation of potassium feldspar phase relations, The Canadian Mineralogist, 17, 515-525 Eggleton R A, Buseck P R (1980) The orthoclase-microcline inversion: A high-resolution transmission electron microscope study and strain analysis, Contributions to Mineralogy and Petrology, 74, 123-133

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Trace-element partitioning between plagioclase, alkali ...

"Trace-element partitioning between plagioclase, alkali feldspar, Ti-magnetite, biotite, apatite, and evolved potassic liquids from Campi Flegrei (Southern Italy)" American Mineralogist 100, no. 1 (2015): 233-249.

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New developments in two-feldspar thermometry | American ...

Two-feldspar pairs from high-grade metamorphic rocks that cooled slowly under dry conditions suffer from a distinct type of retrograde resetting. Whereas the original An content in both the plagioclase and the alkali feldspar is preserved because the intercrystalline Ca + Al ↔ (Na,K) + …

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Resorbed feldspar in a basalt flow* | American ...

During a study of feldspar twins in a thick flow of basalt, an interesting occurrence of partly assimilated feldspar of the fundamental composition of andesine was noted. The distribution and physical characters of these included crystals were studied because of their relation to twin-origin.

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(PDF) Structural Variations Induced by Thermal-Treatment ...

Lead feldspar single crystals were annealed at T = 1050 and 1000 degrees C, starting from a disordered metastable configuration (PbF H, Q od = 0) and from an ordered configuration (PbF L, Q od ...

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Hydrous species in feldspars: A reassessment based on FTIR ...

SIMS is an attractive alternative to FTIR, offering high spatial resolution, high precision, and the feasibility of attaining low detection limits. In this study we compare FTIR and SIMS data for 19 feldspars, including plagioclase, anorthoclase, sanidine, microcline, and orthoclase. We present adjustments to previously published FTIR data on ...

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A DYNAMIC MODEL FOR GRAPHIC OUARTZ FELDSPAR …

Canodian Mineralogist Vol. 30, pp. 571-585 (1992) A DYNAMIC MODEL FOR GRAPHIC OUARTZ_FELDSPAR INTERGROWTHS IN GRANITIC PEGMATITES IN THE SOUTHWESTERN GRENVILLE PROVINCE DAVID R. LENTZ. AND ANTHONY D. FOWLER Ottawo-Carleton Geoscience Centre, and Department of Earth Sciences,

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An alkali feldspar series | SpringerLink

II: Calculations based on volume data. Am. Mineralogist 53, 2000–2017 (1968). Google Scholar Wright, T. L.: X-ray and optical study of alkali feldspar. II: An x-ray method for determining the composition and structural state from measurements of 2Θ values for three reflections. Am. Mineralogist 53, 88–104 (1968).

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Diffusion-controlled and replacement microtextures in ...

Hovis, G.L., Delbove, F. and Roll Bose, M. (1991) Gibbs energies and entropies of K-Na mixing for alkali feldspars from phase equilibrium data: Implications for feldspar solvi and short-range order. American Mineralogist, 76, 913 – 927 .

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NH^+_4 in pegmatitic feldspars from the southern Black ...

G. Cleve Solomon and George R. Rossman NH (super +) 4 in pegmatitic feldspars from the southern Black Hills, South Dakota American Mineralogist, August 1988, v. 73, p. 818-821 Usage Policy: No commercial reproduction, distribution, display or performance rights in this work are provided.

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Revision 2 1 Word count: 8.188 abstract and body text only ...

22 content of K-feldspars falls to nil because of the high solubility of Cs in aqueous solution and 23 low compatibility of Cs in K-feldspar. Otherwise, the observed patterns of K/Rb or K/Cs in K-This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.

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Plagioclase - Wikipedia

Plagioclase is a series of tectosilicate (framework silicate) minerals within the feldspar group. Rather than referring to a particular mineral with a specific chemical composition, plagioclase is a continuous solid solution series, more properly known as the plagioclase feldspar series. This was first shown by the German mineralogist Johann Friedrich Christian Hessel (1796–1872) in 1826.

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The Refinement o-f th9 Crystal Structure of a Synthetic ...

Non-Stoichiometric Sr Feldspar American Mineralogist, Volume 59, pages I319-1326, 1974 Unit Cell and Space Group Single-crystal precession photographs displayed diffraction symmetry C*,/* consistent with the space groups C2, Cm, and C2/m. As there is no evidence to suggest the absence of a center of symmetry, the

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CHARACTERIZATION OF NATURAL FELDSPARS BY RAMAN ...

1477 The Canadian Mineralogist Vol. 46, pp. 1477-1500 (2008) DOI: 10.3749/canmin.46.6.1477 CHARACTERIZATION OF NATURAL FELDSPARS BY RAMAN SPECTROSCOPY FOR …

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Elastic strain effects in coherent perthitic feldspars ...

Am. Mineralogist 53, 88–105 (1968) Google Scholar Wright, T. L., Stewart, D. B.: X-ray and optical study of alkali feldspar: I. Determination of composition and structural state from refined unit cell parameters and 2V. Amer. Mineralogist 53, 38–87 (1968) Google Scholar

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Graphic granite: Mineral information, data and localities.

An intergrowth of quartz and feldspar which may appear as runic or cuneiform writing (hence the term), as darker and glassier quartz 'characters' or 'letters' in a groundmass of white feldspar (usually microcline). This is found almost exclusively in granitic pegmatites, and is believed to result from simultaneous growth of the feldspar and quartz under conditions which favored the planar ...

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Na/K-interdiffusion in alkali feldspar: new data on ...

Exchange experiments between gem-quality alkali feldspar with an initial XOr of 0.85 or 0.72 and Na/K-salt melts have been conducted at temperatures between 800° and 1000° C. The crystals were prepared as crystallographically oriented plates, the polished surfaces corresponding to the (010) or (001) plane of the feldspar. The composition of the melts was varied systematically to induce a ...

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Atomic movements in plagioclase feldspars: Kinetic ...

The diffraction, n.q.r. and optical data on plagioclase feldspars are used to derive kinetic interpretations of structural changes induced by laboratory heat treatment and by geological processes.For anorthite, the Si, Al configuration is essentially ordered except for unusual transient processes. Cooperation between Ca atoms, and random nucleation, produces a domain texture in the primitive ...

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(PDF) Titanium as a cathodoluminescence activator in ...

American Mineralogist, V olume 93, pages 875–879, 2008. ... Alkali feldspars in the Klokken layered syenite (South Greenland) are optically either coarse, turbid, deuteric patch perthites or ...

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(PDF) A dynamic model for graphic quartz-feldspar ...

A dynamic model for graphic quartz-feldspar intergrowths in granitic pegmatites in the Southwestern Grenville Province January 1992 The Canadian Mineralogist 30:571-585

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American Mineralogist Papers in Press

The electrical conductivity of albite feldspar: implications for oceanic lower crustal sequences and subduction zones: George M. Amulele, Anthony W. Lanati, and Simon M. Clark: 10.2138/am-2021-7836: link: Characterization of carbon phases in Yamato 74123 ureilite to constrain the meteorite shock history

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AMCSD Search Results

AMCSD Search Results. Feldspar. Grundy H D, Ito J. American Mineralogist 59 (1974) 1319-1326. The refinement of the crystal structure of a synthetic non-stoichiometric Sr. feldspar. _database_code_amcsd 0000436. 8.3282 12.9801 7.1358 90 115.599 90 C2/m.

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What is Feldspar? (with pictures) - All Things Nature

Mary McMahon Making up about 60% of the earth's crust, feldspar is a blanket term used for a large group of minerals. Feldspar is a blanket term for a very large group of minerals that are extremely abundant on Earth. Around 60% of the Earth's crust is made up of these minerals, in fact, and they have numerous uses for humans, ranging from scouring solutions to glassware.

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Principles of Thermal Expansion in Feldspars - NASA/ADS

Following the recent thermal expansion work of Hovis et al. (1) on AlSi3 feldspars, we have investigated the thermal expansion of plagioclase, Ba-K, and Ca-K feldspar crystalline solutions. X-ray powder diffraction data were collected between room temperature and 925 °C on six natural plagioclase specimens ranging in composition from anorthite to oligoclase, the K-exchanged equivalents of ...

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