Search Results - "Hawthorne, Frank"

Proof that a dominant endmember formula can always be written for a mineral or a crystal structure by Hawthorne, Frank C

“…An endmember formula must be: (1) conformable with the crystal structure of the mineral, (2) electroneutral (i.e., not carry a net electric charge), and (3)…”
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A bond-topological approach to theoretical mineralogy: crystal structure, chemical composition and chemical reactions by Hawthorne, Frank C.

“…Here, I describe a theoretical approach to the structure and chemical composition of minerals based on their bond topology. This approach allows consideration…”
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On the calculation of the relative amounts of endmember constituents for garnet by Hawthorne, Frank C

“…It is commonly accepted that the calculation of the proportions of endmember constituents in garnet is dependent on the particular sequence of calculating the…”
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A structure hierarchy for the aluminofluoride minerals by Hawthorne, Frank C, Herwig, Sasha

“…The structure hierarchy hypothesis states that structures may be ordered hierarchically according to the polymerization of coordination polyhedra of higher…”
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Comprehensive derivation of bond‐valence parameters for ion pairs involving oxygen by Gagné, Olivier Charles, Hawthorne, Frank Christopher

“…Published two‐body bond‐valence parameters for cation–oxygen bonds have been evaluated via the root mean‐square deviation (RMSD) from the valence‐sum rule for…”
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New ion radii for oxides and oxysalts, fluorides, chlorides and nitrides by Hawthorne, Frank C., Gagné, Olivier C.

“…Ion radii are derived here from the characteristic (grand mean) bond lengths for (i) 135 ions bonded to oxygen in 459 configurations (on the basis of…”
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Thermal and shock history of Almahata Sitta meteorite inferred from structure refinement of pyroxene and Mössbauer spectroscopy of Fe‐Ni metal by Abdu, Yassir A., Gismelseed, Abbasher M., Attaelmanan, Atta G., Shaddad, Muawia H., Hawthorne, Frank C.

“…The crystal structures of orthopyroxene (En86.3Fs8.6Wo5.1, space group Pbca) and pigeonite (En81.7Fs8.8Wo9.5, space group P21/c) from the Almahata Sitta…”
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From structure topology to chemical composition; XXX, Refinement of the crystal structure and chemical formula of shkatulkalite, Na2Nb2Na3Ti(Si2O7)2O2(FO)(H2O)4(H2O)3, a lamprophyllite-group (seidozerite supergroup) TS-block mineral from the Lovozero Massif, Kola Peninsula, Russia by Sokolova, Elena, Day, Maxwell C, Hawthorne, Frank C, Camara, Fernando

“…Shkatulkalite, ideally Na5TiNb2(Si2O7)2O3F(H2O)7, is a lamprophyllite-group (seidozerite supergroup) TS-block mineral from the Lovozero massif, Kola Peninsula,…”
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Structure topology and graphical representation of decorated and undecorated chains of edge-sharing octahedra by Lussier, Aaron J, Hawthorne, Frank C

“…Infinite chains of edge-sharing octahedra occur as fundamental building blocks (FBBs) in the structures of several hundred mineral species. Such chains consist…”
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Mass bias corrections for hydrogen and oxygen isotope analysis of tourmaline by secondary ion mass spectrometry by Whattam, Jessica, Sharpe, Ryan, Skelton, Steph, Day, Maxwell C, Fayek, Mostafa, Hawthorne, Frank C

“…Hydrogen (δ2H) and oxygen (δ18O) stable isotopes are used to trace fluid sources, metals, and contaminants in the environment and Earth's subsurface…”
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Raman and FTIR spectroscopy of synthetic amphiboles; II, Divalent (Mg, Co) substitutions at the octahedrally coordinated sites by Della Ventura, Giancarlo, Mihailova, Boriana, Hawthorne, Frank C

“…Raman spectra were recorded for a set of synthetic amphiboles, Na(NaCa)(Mg5-xCox)Si8O22(OH)2 with x = 0-5, that have been previously characterized by Rietveld…”
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Raman and FTIR spectroscopy of synthetic amphiboles; 1, The OH librational bands and the determination of the OH-F content of richterites via Raman spectroscopy by Della Ventura, Giancarlo, Hawthorne, Frank C, Mihailova, Boriana, Sodo, Armida

“…Unpolarized FTIR and Raman spectra were collected in the regions 4000-4600 cm-1 (NIR) and 100-4000 cm-1 from previously synthesized and characterized…”
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Chemographic exploration of the milarite-type structure by Gagné, Olivier C, Hawthorne, Frank C

“…The milarite structure-type has an uncommonly large number of distinct mineral species (23 at present). Here we explore this structure type from the point of…”
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Cation order in the crystal structure of 'Ca-hingganite-(Y)' by Cooper, Mark A, Hawthorne, Frank C, Miyawaki, Ritsuro, Kristiansen, Roy

“…The crystal structure of 'Ca-hingganite-(Y)', triclinic P1, a 9.863(4), b 7.602(3), c 4.762(2) Å, α 90.002(15), β 90.073(7), γ 90.020(5)°, V 357.1(5) Å3, Z =…”
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Alluaudite-group phosphate and arsenate minerals by Tait, Kimberly T, Hawthorne, Frank C, Halden, Norman M

“…A systematic study of alluaudite, hagendorfite, and varulite was done using single-crystal X-ray diffraction, powder diffraction, and electron probe…”
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The crystal structure of zircophyllite, K2NaFe2+7Zr2(Si4O12)2O2(OH)4F, an astrophyllite-supergroup mineral from Mont Saint-Hilaire, Quebec, Canada by Sokolova, Elena, Hawthorne, Frank C

“…Here we report the crystal structure of zircophyllite, ideally K2NaFe2+7Zr2(Si4O12)2O2(OH)4F, from Mont Saint-Hilaire, Quebec, Canada. This is the first…”
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Bortolanite, Ca2(Ca1.5Zr0.5)Na(NaCa)Ti(Si2O7)2(FO)F2, a new rinkite-group (seidozerite supergroup) TS-block mineral from the Bortolan Quarry, Pocos de Caldas Massif, Minas Gerais, Brazil by Day, Maxwell C, Sokolova, Elena, Hawthorne, Frank C, Horvath, Laszlo, Pfenninger-Horvath, Elsa

“…Bortolanite (IMA 2021-040a), ideally Ca2(Ca1.5Zr0.5) Na(NaCa) Ti(Si2O7)2(FO)F2, is a rinkite-group (seidozerite supergroup) TS-block mineral from Pocos de…”
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Bonding between the decavanadate polyanion and the interstitial complex in pascoite-family minerals by Hawthorne, Frank C, Hughes, John M, Cooper, Mark A, Kampf, Anthony R

“…The decavanadate isopolyanion, [V10O28]6-, is a constituent of pascoite-family vanadate minerals and synthetic materials, and both protonated,…”
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Bond-length distributions for ions bonded to oxygen: results for the transition metals and quantification of the factors underlying bond-length variation in inorganic solids by Gagné, Olivier Charles, Hawthorne, Frank Christopher

“…Bond-length distributions are examined for 63 transition metal ions bonded to O in 147 configurations, for 7522 coordination polyhedra and 41 488 bond…”
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Synthesis and solid solution in “rubidium richterite”, Rb(NaCa)Mg5Si8O22(OH,F)2 by Della Ventura, Giancarlo, Hawthorne, Frank C., Iezzi, Gianluca

“…The OH–F substitution in “synthetic Rb-richterite” has been investigated along the join Rb(NaCa)Mg 5 Si 8 O 22 (OH) 2 –Rb(NaCa)Mg 5 Si 8 O 22 (F) 2 . Syntheses…”
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