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Marinellite, a New Feldspathoid of the Cancrinite-Sodalite Group
Eur. J. Mineral. 2003, 15, 1019–1027 Marinellite, a new feldspathoid of the cancrinite-sodalite group ELENA BONACCORSI* and PAOLO ORLANDI Dipartimento di Scienze della Terra, Universita` di Pisa, Via S. Maria 53, I-56126 Pisa, Italy * Corresponding author, e-mail: [email protected] Abstract: Marinellite, [(Na,K)42Ca6](Si36Al36O144)(SO4)8Cl2·6H2O, cell parameters a = 12.880(2) Å, c = 31.761(6) Å, is a new feldspathoid belonging to the cancrinite-sodalite group. The crystal structure of a twinned crystal was preliminary refined in space group P31c, but space group P62c could also be possible. It was found near Sacrofano, Latium, Italy, associated with giuseppettite, sanidine, nepheline, haüyne, biotite, and kalsilite. It is anhedral, transparent, colourless with vitreous lustre, white streak and Mohs’ hardness of 5.5. The mineral does not fluoresce, is brittle, has conchoidal fracture, and presents poor cleavage on {001}. Dmeas is 3 3 2.405(5) g/cm , Dcalc is 2.40 g/cm . Optically, marinellite is uniaxial positive, non-pleochroic, = 1.495(1), = 1.497(1). The strongest five reflections in the X-ray powder diffraction pattern are [d in Å (I) (hkl)]: 3.725 (100) (214), 3.513 (80) (215), 4.20 (42) (210), 3.089 (40) (217), 2.150 (40) (330). The electron microprobe analysis gives K2O 7.94, Na2O 14.95, CaO 5.14, Al2O3 27.80, SiO2 32.73, SO3 9.84, Cl 0.87, (H2O 0.93), sum 100.20 wt %, less O = Cl 0.20, (total 100.00 wt %); H2O calculated by difference. The corresponding empirical formula, based on 72 (Si + Al), is (Na31.86K11.13Ca6.06) =49.05(Si35.98Al36.02)S=72O144.60(SO4)8.12Cl1.62·3.41H2O. -
26 May 2021 Aperto
AperTO - Archivio Istituzionale Open Access dell'Università di Torino The crystal structure of sacrofanite, the 74 Å phase of the cancrinite–sodalite supergroup This is the author's manuscript Original Citation: Availability: This version is available http://hdl.handle.net/2318/90838 since Published version: DOI:10.1016/j.micromeso.2011.06.033 Terms of use: Open Access Anyone can freely access the full text of works made available as "Open Access". Works made available under a Creative Commons license can be used according to the terms and conditions of said license. Use of all other works requires consent of the right holder (author or publisher) if not exempted from copyright protection by the applicable law. (Article begins on next page) 05 October 2021 This Accepted Author Manuscript (AAM) is copyrighted and published by Elsevier. It is posted here by agreement between Elsevier and the University of Turin. Changes resulting from the publishing process - such as editing, corrections, structural formatting, and other quality control mechanisms - may not be reflected in this version of the text. The definitive version of the text was subsequently published in MICROPOROUS AND MESOPOROUS MATERIALS, 147, 2012, 10.1016/j.micromeso.2011.06.033. You may download, copy and otherwise use the AAM for non-commercial purposes provided that your license is limited by the following restrictions: (1) You may use this AAM for non-commercial purposes only under the terms of the CC-BY-NC-ND license. (2) The integrity of the work and identification of the author, copyright owner, and publisher must be preserved in any copy. -
THE MELILITE (Gh50) SKARNS of ORAVIT¸A, BANAT, ROMANIA: TRANSITION to GEHLENITE (Gh85) and to VESUVIANITE
1255 The Canadian Mineralogist Vol. 41, pp. 1255-1270 (2003) THE MELILITE (Gh50) SKARNS OF ORAVIT¸A, BANAT, ROMANIA: TRANSITION TO GEHLENITE (Gh85) AND TO VESUVIANITE ILDIKO KATONA Laboratoire de Pétrologie, Modélisation des Matériaux et Processus, Université Pierre et Marie Curie, 4, Place Jussieu, F-75252 Paris, Cedex 05, France MARIE-LOLA PASCAL§ CNRS–ISTO (Institut des Sciences de la Terre d’Orléans), 1A, rue de la Férollerie, F-45071 Orléans, Cedex 02, France MICHEL FONTEILLES Laboratoire de Pétrologie, Modélisation des Matériaux et Processus, Université Pierre et Marie Curie, 4, Place Jussieu, F-75252 Paris, Cedex 05, France JEAN VERKAEREN Unité de Géologie, Université Catholique de Louvain-la-Neuve, Bâtiment Mercator, 3, Place Louis Pasteur, Louvain-la-Neuve, Belgium ABSTRACT Almost monomineralic Mg-rich gehlenite (~Gh50Ak46Na-mel4) skarns occur in a very restricted area along the contact of a diorite intrusion at Oravit¸a, Banat, in Romania, elsewhere characterized by more typical vesuvianite–garnet skarns. In the vein- like body of apparently unaltered gehlenite, the textural relations of the associated minerals (interstitial granditic garnet and, locally, monticellite, rare cases of exsolution of magnetite in the core zone of melilite grains) suggest that the original composi- tion of the gehlenite may have been different, richer in Si, Mg, Fe (and perhaps Na), in accordance with the fact that skarns are the only terrestrial type of occurrence of gehlenite-dominant melilite. The same minerals, monticellite and a granditic garnet, appear in the retrograde evolution of the Mg-rich gehlenite toward compositions richer in Al, the successive stages of which are clearly displayed, along with the final transformation to vesuvianite. -
The Erystal Strueture of Bieehulite, Ca2[Ai2si06](OH)2
Zeitsclll'ift fiir Kristallographie, Bd, 146, S. 35-41 (1977) ~ by Akademische Verlagsgesellschaft, vViesbaden 1977 The erystal strueture of bieehulite, Ca2[AI2Si06](OH)2 By Knt'l' SARI, and NmA:-I.IAN DEH CRA'l"fl<,RJEE Institut fiir Mineralogie, Ruhr- U niversitiit, Boehum (Received 29 .January 1977) Auszug Die Kristallstruktur von synthetiscllOm Bicchulit wurde mit Rontgen- Einkristallmethoden bestimmt (R = 0,07 fUr aile 65 beobachteten Reflexe). Bicchulit hat eine Geruststruktur vom Sodalith-Typ. Al und Si sind statistisch auf die Tetraederpliitze verteilt und nul' von Sauorstoffatomen koordiniert. Calcium ist von drei Sauerstoffatomen und drei OR-Gruppen oktaedrisch umgeben. .1eweils vier wIehe Oktaeder sind libel' gemeinsame OR-OR-Kanten zu einer Vierergruppe verkniipft. Diese Vierergruppen sind in die Hohlriiume des Geriists eingelagcrt. Abstract The crystal structure of synthetic bicchulite was determined with single- crystal x-ray methods (R = 0.07 for all 65 observed reflections). Bicchulite has a sodalite-type framework structure with Al and Si distributed statistically in the tetrahedral sites, coordinated solely by oxygen atoms. Calcium is coordinated octahedrally by three oxygen atoms and three OR groups. Four such octahedra are linked to a group by OR -OR edges. ThesE' octahedra groups occupy the cavities within the fntm8work. Introduetion Single crystals of synthetic bicchulite, Ca2[AhSi06](OH)2 were grown under hydrothermal conditions by GUPTA and CHATTERJEE (1977). The crystals were more or less equidimensional but very small (at most (J.()5mm in diameter). GUPTA and CHATTERJEE (1977) deter- mined the lattice constants of bicchulite from powder patterns (Guinier and powder diffractometer method, Cu radiation). They indexed the powder patterns on the basis of a body-centered cubic cell, as sug- gested by HENMI et al. -
A Specific Gravity Index for Minerats
A SPECIFICGRAVITY INDEX FOR MINERATS c. A. MURSKyI ern R. M. THOMPSON, Un'fuersityof Bri.ti,sh Col,umb,in,Voncouver, Canad,a This work was undertaken in order to provide a practical, and as far as possible,a complete list of specific gravities of minerals. An accurate speciflc cravity determination can usually be made quickly and this information when combined with other physical properties commonly leads to rapid mineral identification. Early complete but now outdated specific gravity lists are those of Miers given in his mineralogy textbook (1902),and Spencer(M,i,n. Mag.,2!, pp. 382-865,I}ZZ). A more recent list by Hurlbut (Dana's Manuatr of M,i,neral,ogy,LgE2) is incomplete and others are limited to rock forming minerals,Trdger (Tabel,l,enntr-optischen Best'i,mmungd,er geste,i,nsb.ildend,en M,ineral,e, 1952) and Morey (Encycto- ped,iaof Cherni,cal,Technol,ogy, Vol. 12, 19b4). In his mineral identification tables, smith (rd,entifi,cati,onand. qual,itatioe cherai,cal,anal,ys'i,s of mineral,s,second edition, New york, 19bB) groups minerals on the basis of specificgravity but in each of the twelve groups the minerals are listed in order of decreasinghardness. The present work should not be regarded as an index of all known minerals as the specificgravities of many minerals are unknown or known only approximately and are omitted from the current list. The list, in order of increasing specific gravity, includes all minerals without regard to other physical properties or to chemical composition. The designation I or II after the name indicates that the mineral falls in the classesof minerals describedin Dana Systemof M'ineralogyEdition 7, volume I (Native elements, sulphides, oxides, etc.) or II (Halides, carbonates, etc.) (L944 and 1951). -
The Efficiency of Quartz Addition on Electric Arc Furnace (EAF)
The efficiency of quartz addition on electric arc furnace (EAF) carbon steel slag stability D. Mombelli a,∗, C. Mapelli a, S. Barella a, A. Gruttadauria a, G. Le Saout b, E. Garcia-Diaz b a Politecnico di Milano, Dipartimento di Meccanica, Via La Masa 1, 20156 Milano, Italy b Centre des Matériaux des Mines d’Alès (C2MA) —Ecole des Mines d’Alès (Institut Mines Telecom), Avenue de Clavières 6, 30100 Alès cedex, France h i g h l i g h t s • A method to stabilize EAF slag was implemented in an actual steel plant. • The stabilization treatment lead to the formation of slag with gehlenite matrix. • The stabilization process efficacy was confirmed by several leaching tests. • Gehlenite inhibits heavy metals leaching. a b s t r a c t Electric arc furnace slag (EAF) has the potential to be re-utilized as an alternative to stone material, however, only if it remains chemically stable on contact with water. The presence of hydraulic phases such as larnite (2CaO SiO2) could cause dangerous elements to be released into the environment, i.e. Ba, V, Cr. Chemical treatment appears to be the only way to guarantee a completely stable structure, especially for long-term applications. This study presents the efficiency of silica addition during the deslagging period. Microstructural characterization of modified slag was performed by SEM and XRD analysis. Elution tests were performed according to the EN 12457-2 standard, with the addition of silica and without, and the obtained results were compared. These results demonstrate the efficiency of the inertization process: the added silica induces the formation of gehlenite, which, even in caustic environments, does not exhibit hydraulic behaviour. -
The Effect of the Regular Solution Model in the Condensation of Protoplanetary Dust
Mon. Not. R. Astron. Soc. 000, 1{?? (2010) Printed 4 June 2018 (MN LATEX style file v2.2) The effect of the regular solution model in the condensation of protoplanetary dust F. C. Pignatale1?, S. T. Maddison1;2, V. Taquet1;2;3, G. Brooks4, K. Liffman5 1Centre for Astrophysics & Supercomputing, Swinburne University, H39, PO Box 218, Hawthorn, VIC 3122, Australia 2Laboratoire d'Astrophysique de Grenoble, UMR 5571 Universit´eJoseph Fourier/CNRS, BP 53, 38041 Grenoble cedex 9, France 3Magistere de Physique Fondamentale d'Orsay, Universite Paris-11, France 4Mathematics Discipline, FEIS, Swinburne University, H38, PO Box 218, Hawthorn, VIC 3122, Australia 5CSIRO/MSE, PO Box 56, Heightt, VIC 3190, Australia Accepted 2011 February 16. Received 2011 February 14; in original form 2010 July 22 ABSTRACT We utilize a chemical equilibrium code in order to study the condensation process which occurs in protoplanetary discs during the formation of the first solids. The model specifically focuses on the thermodynamic behaviour on the solid species assuming the regular solution model. For each solution, we establish the relationship between the activity of the species, the composition and the temperature using experimental data from the literature. We then apply the Gibbs free energy minimization method and study the resulting condensation sequence for a range of temperatures and pressures within a protoplanetary disc. Our results using the regular solution model show that grains condense over a large temperature range and therefore throughout a large portion of the disc. In the high temperature region (T > 1400 K) hibonite and gehlenite dominate and we find that the formation of corundum is sensitive to the pressure. -
Gehlenite Ca2al(Alsi)O7 C 2001 Mineral Data Publishing, Version 1.2 ° Crystal Data: Tetragonal
Gehlenite Ca2Al(AlSi)O7 c 2001 Mineral Data Publishing, version 1.2 ° Crystal Data: Tetragonal. Point Group: 42m: Crystals are commonly short prismatic, resembling octahedrally modi¯ed cubes; granular, massive. Twinning: On 100 , 001 ; lamellar f g f g on 001 . f g Physical Properties: Cleavage: Distinct on 001 , poor on 110 . Fracture: Uneven, f g f g splintery to conchoidal. Tenacity: Brittle. Hardness = 5{6 D(meas.) = 3.038 D(calc.) = 3.03 Optical Properties: Transparent to translucent and opaque. Color: Colorless, brown, yellowish, greyish green; colorless to pale yellow in thin section. Streak: White to grayish white. Luster: Vitreous to resinous. Optical Class: Uniaxial ({). Pleochroism: May show anomalous Berlin blue interference colors. Absorption: Weak; O > E. ! = 1.669 (synthetic). ² = 1.658 Cell Data: Space Group: P 421m (synthetic). a = 7.6850(4) c = 5.0636(3) Z = 2 X-ray Powder Pattern: Crestmore, California, USA. 2.848 (100), 1.818 (75), 1.921 (64), 3.066 (43), 2.437 (38), 1.768 (36), 2.738 (32) Chemistry: (1) (2) (3) SiO2 30.09 22.86 21.91 TiO2 trace Al2O3 21.67 32.09 37.19 Fe2O3 1.36 3.03 FeO 2.14 MnO 0.04 MgO 3.87 0.85 CaO 38.36 41.25 40.90 Na2O 0.75 K2O 0.16 + H2O 1.64 Total 100.08 100.08 100.00 (1) Val di Fassa, Italy. (2) Carneal, Ireland; by electron microprobe. (3) Ca2Al(AlSi)O7: Polymorphism & Series: Forms a series with ºakermanite. Mineral Group: Melilite group. Occurrence: In contact metamorphosed impure limestones; in calcium-rich ultrama¯c volcanic rocks. -
Bicchulite Ca2al2sio6(OH)2 C 2001 Mineral Data Publishing, Version 1.2 ° Crystal Data: Cubic
Bicchulite Ca2Al2SiO6(OH)2 c 2001 Mineral Data Publishing, version 1.2 ° Crystal Data: Cubic. Point Group: 43m: As an extremely ¯ne powder. Physical Properties: Hardness = n.d. D(meas.) = n.d. D(calc.) = 2.813 (synthetic). Optical Properties: Semitransparent. Color: White or gray; colorless in thin section. Luster: Powdery, earthy. Optical Class: Isotropic. n = 1.625 Cell Data: Space Group: I43m: a = 8.82{8.83 Z = 4 X-ray Powder Pattern: Fuka, Japan. 2.786 (100), 2.753 (95), 3.60 (90), 2.597 (50), 1.559 (50), 3.04 (40), 2.96 (40) Chemistry: (1) (2) (3) SiO2 28.51 23.77 20.56 TiO2 0.09 0.92 Al2O3 21.79 23.59 34.89 Fe2O3 2.66 6.72 FeO 0.25 0.20 MnO 0.03 0.02 MgO 2.72 2.00 CaO 35.26 36.89 38.38 Na2O 0.25 0.14 K2O 0.18 0.11 + H2O 8.03 4.79 6.17 H2O¡ 0.43 0.40 P2O5 0.02 0.02 Total 100.22 99.57 100.00 (1) Fuka, Japan; mixed with vesuvianite. (2) Do.; contaminated by small amounts of gehlenite, vesuvianite, and hydrogrossular. (3) Ca2Al2SiO6(OH)2: Polymorphism & Series: Dimorphous with kamaishilite. Occurrence: In skarns in limestones, formed through alteration of gehlenite subjected to later retrograde hydration reactions. Association: Vesuvianite, hydrogrossular, gehlenite, melilite, calcite. Distribution: From Fuka, near Bicchu, Okayama Prefecture, and in the Akagan¶e mine, Iwate Prefecture, Japan. At Carneal, Co. Antrim, Ireland. Name: For Bicchu, the town encompassing the Japanese type locality. Type Material: Department of Earth Sciences, Okayama University, Okayama, Japan, ONM-01; Institute of Geological Sciences, London, England. -
THE ~Lineralogy of the HATRURIM FORMATION, ISRAEL
THE ~lINERALOGY OF THE HATRURIM FORMATION, ISRAEL ABSTRACT The l]atrurim Formation, (formerly known as the reported from only one locality. "Mottled Zone") is <1 unique rock complex, exposed Optical data, X-ray diffraction data, thermal analyses, mainly in the Judean Desert. It was apparently de chemical analyses and crystal morphology (by SEM) posited as a normal marine, chalky-marly sequence of of the minerals were obtained. Chemical analyses of Campanian to Neogene age, but is today largely com naturally occurring tricakium silicate (batrurite). nagel posed of high-temperature metamorphic minerals schmidtite, portlandite and 6CaO.2Fe2 0\.AI2O~ (un corresponding to the sanidinite and pyroxene-hornfels named) are reported for the first time. facies. No indication of contact metamorphism is, Most of the minerals were formed during one of the however, found in the area. One hundred fourteen following stages: low to high-grade metamorphism, minerals are described. Eight of them were previously retrograde metamorphism, hydrothermal alteration and known only as synthetic products and five others were weathering processes. INTRODUCfION age), and clays and marls of the Taqiye Forma tion (Dano-Paleocene Age), are found overlying A. The Hatrurim Formation: flint and phosphorite beds of the Mishash description and occurrence Formation (Campanian age). In many outcrops and in subsurface sections, these rocks are The present mineralogical investigation of the bituminous. The lower part of the Ghareb ijatrurim Formation (Gvirtzman and Buch Formation may contain up to 26% organic binder, 1966), formerly described as the Mottled matter and can be classified as oil shales (Shahar Zone Complex (Picard 1931; Bentor 1960), is and Wurzburger, 1967). -
New Mineral Names E55
American Mineralogist, Volume 67, pages 854-860, l,982 NEW MINBRAL NAMES* MrcHa.Br-FrerscHen, G. Y. CHeo ANDJ. A. MeNoenrNo Arsenocrandallite* Although single-crystal X-ray ditrraction study showed no departure from cubic symmetry, the burtite unit Kurt Walenta (1981)Minerals of the beudantite-crandallitegroup cell is consid- eredto be rhombohedralwith space-groupR3, a,6 = 8.128A,a = from the Black Forest: Arsenocrandallite and sulfate-free 90', Z = 4 (a : 11.49,c : 14.08Ain hexagonalserting). weilerite. Schweiz. Mineralog. petrog. Mitt., 61,23_35 (in The German). strongestlines in the X-ray powder ditrraction pattern are (in A, for CoKa, indexing is based on the pseudo-cubic cell): Microprobe analysis gave As2O522.9, p2}s 10.7, Al2O32g.7, 4.06(v sX200), I .E I 4(s)(420),1.657 (s)@22), 0. 9850(sX820,644) and Fe2O31.2, CaO 6.9, SrO 6.0, BaO 4.3, CuO 1.8,ZnO 0.3,Bi2O3 0.9576(sX822,660). 2.4, SiO2 3.2, H2O (loss on ignition) 11.7, sum l}}.lVo cor_ Electron microprobe analysis(with HrO calculatedto provide responding to (Ca6.5,,S16.2eBas.1aBir.65)1.6e(Al2.7eCus.11Fefifl7 the stoichiometric quantity of OH) gave SnO256.3, CaO 20.6, Zno.oz)r.gs(Aso.ss P6.75Si6.26) z.oo He.cq O13.63,or MgO 0.3, H2O 20.2, total 97.4 wt.Vo. These data give an (Ca,Sr)Al:Ht(As,P)Oal2(OH)6. Spectrographicanalysis showed empirical formula of (Canes2Mga oro)>r.oozSno ngn(OH)6 or, ideal- small amounts of Na, K, and Cl. -
Refinement of the Crystal Structure of Bicchujite, Caz[Alzsi06](OH)Z
Zeitschrift fUr Kristallographie 152, 13 - 21 (1980) (' by Akademische Verlagsgesellschaft 1980 Refinement of the crystal structure of bicchuJite, Caz[AlzSi06](OH)z Kurt Sahl Institut fUr Mineralogie der Ruhr-Universitiit, Postfach 102148, D-4630 Bochum-Querenburg, Federal Republic of Germany Received: January 23, 1979 Abstract. The crystal structure of synthetic bicchulite was refined from X-ray single-crystal data (R = 0.012 for all 121 symmetry-independent observed reflections). Bicchulite has a sodalite-type framework structure with AI and Si distributed statistically on the tetrahedral sites. The calcium ions and empty (OH)4-tetrahedra occupy the cavities of the framework. The bonding of the hydrogen atoms is discussed. Introduction The crystal structure of bicchulite, Caz[AlzSi06](OH)z has recently been determined by Sahl and Chatterjee (1977) from X-ray data measured on a Hilger and Watts four-circle diffractometer (Mo radiation). They used a synthetic single crystal with a diameter of about 0.05 mm, the largest crystal of good quality which was available. Due to the high symmetry and small volume of the crystal, only 65 symmetry-independent reflections with a significant intensity could be measured in the range up to e = 35°. The structure was determined and refined to R = 0.07. This result, however, was not entirely satisfacory: the distances 0-0 in the (AI,Si)04- tetrahedra varied between 2.75 and 2.95 A, the angles 0 - (AI,Si) - 0 from 106° to 1180. It was not possible to determine the positions of the hydrogen atoms, which are of importance in view of the rather unusual configuration of the (OH)-groups: they form empty (OH)4-tetrahedra around the origin and the center of the cell.