 | | Journal (issue) | | localities: Minerals of the Kaokoveld District, Kunene Region, Namibia ............................................ 485 by R. J. Bowell, 0. Ermolina, W van der Plas, J. van Us & M. Steiner The best zincite crystals...shattuckite, 7.1 cm, from the Kaokoveld District, Kunene Region, Namibia. Irv Brown specimen; Jeff Scovil photo...the best vesuvianite specimens from the Jeffrey mine in Quebec. In this issue we present a review of...Herodsfoot Mine Work Readers who enjoyed Roy Starkey's superb article on the famous Herodsfoot mine in Cornwall |  | | Journal (article/letter/editorial) | | any two univar(a) between FeeO 3 phases (e.g. hematite : magheiant curves are areas of divariant equilibrium...considered no further since the literagoethite and hematite. This system shows two ture is clear on the points...gibbsite is colinear with boehof interest here hematite is the stable polymorph of mite and water and...dehydration reaction FeOOH = Fe20 3 + H20; and goethite hematite Water FeOOH~ 20a3tie HFaeegm M hemtie (d)...reaction AI(OH)3 + Fe20 3 = 2FeOOH + A1OOH gibbsite hematite goethite boehmite 389 AI(OH)3 Diaspore 390 |  | | Journal (article/letter/editorial) | | usually involve cumbersome calculations (Van der Plas and Van Schuylenborgh, 1970). The procedure proposed...Imbrie and Poldervaart, 1959; Nicholls, 1962; Van der Plas and Van Schuylenborgh, 1970). Although these calculation...5MgO. 4H20 (d) Secondary oxides and hydroxides Hematite Goethite Corundum Gibbsite Pyrolusite Fe203 ...corundum. (26) If Fe203 (l) > H20 (2), form goethite, hematite and corundum. (27) If Fe203(I)=H20 (2), form goethite...absent. G=gibbsite; K=kaolinite; Go=goethite; H = hematite; Ma = maghemite; A = anatase; Q = quartz. analyses |  | | Journal (article/letter/editorial) | | faults resulting from orogeny during the Cenozoic. Van Houten and Travis (1968, p. 678-679) divided the...Cretaceous marine strata were deposited. Cenozoic. Van Houten and Travis (1968) reviewed the general Cenozoic...sedimentary rocks which may be polygenetic (Van der Plas, 1966, p. 132). Nevertheless, the Michel-Levy...results for a point count of 200 is as follows (Van der Plas and Tobi, 1965): percent determined (95% confidence...genesis or provenance from it. However, Schlocker and Van Horn (1958) found that illite interlayered with a |  | | Journal (article/letter/editorial) | | 55-69; Dengo, 1953, p. 25; Banno, 1958, p. 36; van der Plas, 1959, p. 514), indicating that in some environments...muscovite-paragonite-phengite (-biotite); and (7) hematite-magnetite-pyrite-sphene (pyrrhotite-rutile). Most...observers (including Gansser, 1937, p. 468; van der Plas. 1959, pp. 498, 513-14, Alps; Dengo, 1953, p...with oxidation state defined by the oxide pair hematite+ magnetite, riebeckite is stable at temperatures...oxygen pressure is defined by coexistence with hematite and magnetite. Chloritoid has been synthesized |  | | Journal (article/letter/editorial) | | occurs in some typical contact deposits within the region. These ilvaites are generally much richer in Mn...(Bøggild 1902), in dolerites and gabbros (Barton & Van Bergen 1984), in tonalite (Naslund et al. 1983),...ilvaite was briefly mentioned from the Breigangen mine, 5 km NNW of Skien town. Apart from the type locality...the ilvaite-bearing veins is given in Table 1. Hematite was deposited as an early mineral in most of the...helvite ferroactinolite stilpnomelane chlorite hematite pyrite pyrrhotite sphalerite chalcopyrite M M |  | | Journal (article/letter/editorial) | | Quartz-garnet-calcic amphibole-sodic amphibole-epidote-hematite. Detailed studies of the mineralogy and petrology...blueschist facies conditions. It is logical that this region of immiscibility, if it is real, is largely a result...barroisite, have been reported from Switzerland (van der Plas, 1959), Japan (Banno, 1964), New Caledonia (Coleman...(1967). On the other hand, Dengo (1953) and van der Plas (1959) report the occurrence of sodic and calcic...379 pp. DENGO, G., 1953. Geology of the Caracas region, Venezuela. Bull. geol. Soc. Am. 64, 7-40. DUNCUMB |  | | Journal (article/letter/editorial) | | ,epidote chloriteleucoxenecalcite) Bidwell Bar region, Calif Dunham (pus conru,) Q\artz dioilte (q uartz-mi...aegirine-amphibole-muscovite-quartz with minor Shikoku, hematite and apatite Bizan, Japan Detailed description...less Fe, on the basis of optical properties Van der Plas ud. Iliigi 11961).l|tretamoryhic ophiolite consisting...by Compton (1955 and 1958) from the Bidwell Bar region, California. Another such assemblage(no. 2-2) was...four 2-amphibole occurrencesof the Bidwell Bar region are very similar in texture. The hornblende occurs |  | | Journal (article/letter/editorial) | | albite, chlorite, white mica, epidote, titanite, hematite, pyrite and carbonate. It is remarkable that these...grain sizes up to several centimeter are common. Hematite can often be seen filling small cracks. Petrography...albite, chlorite, white mica, epidote, titanite, hematite, pyrite and carbonate (and goethite), see Table...titanite in small, very fine-grained aggregates, and hematite - are pseudomorphous after biotite (aggregates)...or biotite - now nearly completely replaced by hematite (martite). The basic bodies within the Ballsj6n |  | | Journal (article/letter/editorial) | | Al4[Si4O10][OH]8. Bauxite consists of gibbsite, hematite (Fe2O3), goethite (α-FeO(OH)), and quartz. The...kaolinite, and halloysite, and are enriched in hematite. Bauxitization of finely grained quartz–muscovite–feldspar...(60–90%) and almandine is replaced with gibbsite and hematite (5–30%). They contain ilmenite, graphite, and...pseudomorphs mixed with kaolinite, goethite, and hematite. Under these conditions, high-quality gibbsite...(1980). 15. Ch. Anbeek, N. van Breemen, E. L. Meijer, and L. van der Plas, Geochim. Cosmochim. Acta 58 |  | Tollefsen, Elin, Stockmann, Gabrielle, Skelton, Alasdair, Lundqvist, Lena, Sturkell, Erik (2019) Secondary alteration of the Grønnedal-Ika igneous complex and the genesis of ikaite, CaCO3·6H2O, SW Greenland. Chemical Geology, 510. 18-30 doi:10.1016/j.chemgeo.2019.02.009 | Journal (article/letter/editorial) | | biotite and the carbonatites of calcite, siderite, hematite and magnetite (Emeleus 1964). The carbonatite...counting were calculated using the method of Van der Plas and Tobi (1965). ACCEPTED MANUSCRIPT Twenty-five...crystals SC also contain abundant small (<0.3 mm) hematite crystals. Iron oxide replacing aegirine-augite...ET14604 occurs either as euhedral crystals NU of hematite or along cleavages. Patches of sericite replace...apatite which occur in association with sericite and hematite in sample 14FF13A. PT E D 5.1.2. Carbonatite |  | | Journal (article/letter/editorial) | | Buddington et al. (1964) as a subsolidus reduction of hematite to magnetite. This texture is rarely observed...analyzed primary ilmenites have only 4.6 6.7 mole% hematite solid solution and presumably have only small...35 seconds for all analyses. Natural ilmenite, hematite, rutile and synthetic manganese and vanadium oxides...sampling error at less than 2% following curves by Van Der Plas and Tobi (1965). Generally between 3 and 6 grains...formulae for density determinations, P = (Xilmenlte-hematite ss) (pilmenite-hematlte ss) -I- '~ XA PA where |  | | Journal (article/letter/editorial) | | K-feldspar (Al), olivine (Mg), spessartine (Mn) and hematite, metallic iron (Fe). Table 1 presents the compositions...eV (Garvie and Craven 1994; Garvie et al. 1994; van Aken et al. 1998a, b). The energy resolution in the...lower energies of the oxygen K edge is due to Fe3+ (van Aken et al. 1998b). This indicates that all Fe2+...results of dehydration experiments reported by van der Plas et al. (1958) and Puga (1970) for Fe-rich chloritoids...structure at around 750 °C, in both air and N2. Van der Plas et al. (1958) used thermal dierential and thermal |  | Skelton, A., Hode Vuorinen, J., Arghe, F., Fallick, A. (2007) Fluid–rock interaction at a carbonatite-gneiss contact, Alnö, Sweden. Contributions to Mineralogy and Petrology, 154 (1) 75-90 doi:10.1007/s00410-007-0180-1 | Journal (article/letter/editorial) | | metasomatised region. We suggest that reactive weakening caused the metasomatised region to widen and...and replacement by albite and reddening due to hematite inclusions, (3) recrystallisation of biotite to...to a fine-grained aggregate with K-feldspar and hematite, and (4) growth of arfvedsonite and aegirine–augite...wollastonite in the shear zone, c the zone of hematite veining, d the calcite + nepheline + diopside...to the shear zone and surrounding a region with extensive hematite veining, located 23.6 m SW of the shear |  | | Journal (article/letter/editorial) | | 22.0 0.02 . . 1.85 10.9 0.15 100.4 Ilmenite-hematite r E3-314 E3-313 c . . . Microperthite phenocryst...following p r o c e d u r e s described in V a n D e r Plas a n d T o b i (1965) 515 trometers. An accelerating...Plagioclase Biotite Quartz K-feldspar Ilmenite + Hematite Exercise (a) Exercise (b) 0.34 + / - 0 . 0...errors computed using procedures described in Van Der Plas and Tobi (1965), depend on the number of phenocrysts...orthoclase, plagioclase, quartz, biotite, and ilmenite-hematite respectively. These weight fractions closely resemble |  | | Journal (article/letter/editorial) | | THE MBEYA CARBONATITE L. J. FICK AND C. VAN DER HEYDE CONTENTS PAGE Abstract ...............surroundingsof the Mbeya Carbonatiteis given by van der Heyde. In it argumentsare given for a revisedage...alteredbasementgneisses. 844 L. .t. FICK AND C. VAN DER HEYDE This orebody,a carbonatiteplug consistingof...Netherlands,especiallyto its mineralogistMr. A. H. van der Veen, who has collaboratedwith the petrographi...relatively minor units. 846 L. J. FICK AND C. VAN DER HEYDE Structurallythe Basementsystemmay be characterized |  | | Journal (article/letter/editorial) | | 5,8580 (4)/~ und [3= 90,332 (6) °. Die Qualit/it der Proben wurde mit M6ssbauerSpektroskopie iiberpriift...3 kbar, 330 °C and the oxygen fugacities of an hematite/magnetite buffer. Thepositions of the most intense...Syntheses at the oxygen fugacities of the magnetite/hematite buffer and temperatures between 330 and 400 °C...3 kbar, 330 °C and the oxygen fugacities of an hematite/magnetite buffer. The spectrum was evaluated by...4.0 Kbars and at the oxygen fugacities of the hematite/magnetite buffer have shown. The quality of the |  | | Book | | localities for good ilmenite crystals exist in the region (Brunet, I 977b ). NEW YORK Amity, Orange County...Springfield show ( 1995: 582). Madawaska [Faraday] mine near Bow Lake, Hastings County. Some of the world's...property of, the old Madawaska uranium mine (called the Faraday mine before 1964). The mineral assemblage...lustrous, though some which are coated by rutile or hematite are yellow or red and earthy; they are equant...different combinations of rutile, anatase, brookite, hematite and titanite (Philippe Beiley, personal communication |  | | Journal (article/letter/editorial) | | resulted in a minute intergrowth consisting of hematite and hedenbergite. According to Robie Re¯ectance...by Dietrich (1972), the breakdown of ilvaite to hematite and clinopyroxene begins to develop at 785 C...Suppl 1] 9: 427 Bartholome P, Duchesne JC, Van der Plas L (1968) Sur une forme monoclinique de l'ilvaite |  | | Journal (article/letter/editorial) | | includes the minerals lawsonite and glaucophane (Van der Plas, 1959; Lorenzoni, 1965; Ernst, 1973). As part...+quartz 17 at 300~ well within the stability of hematite and hausmanite. This compares well with estimations...Wiley and Sons, Inc. 1892 Doelter, C.A.: Handbuch der Mineralchemie, Vol.2. Dresden und Leipzig: Verlag...Manchester University Press 1974 Hintze, C.: Handbuch der Mineralogie, Vol. 2. Leipzig: Verlag Von Vert and...Petrol. 39, 239-245 (1973) Plas, L. Van der: Petrology of the Northern Adula Region, Switzerland, (with particular |  | | Report (issue) | | stratigraphy of part of McLendon volcano, Anderson mine area, Yavapai County, Arizona By William E. Brooks...caldera. Late Tertiary sediments at the Anderson mine contain uranium deposits interpreted as volcanogenic...is from Arizona Highway 93 and unpaved ranch and mine roads. The closest urban center is Phoenix, Ariz...sections based on a traverse of 500 points (Van Der Plas and Tobi, 1965). Plagioclase compositions were...Peach Springs Tuff Artillery Mountains Anderson Mine Mogollon-Datil volcanic field Vulture Mountains |  | | Journal (article/letter/editorial) | | (hopping) known to take place in this temperature region. octahedra (B sites) are attached along the chains...with magnetic and thermal effects observed in this region by other techniques. The thermal expansion is positive...exothermic D T A effect appears. Here decomposition to hematite and clinopyroxene begins, and at 1448 K the sample...weight of about one weight percent. On cooling, hematite and clinopyroxene are again formed. Thus Dietrich...antiferromagnetic transition in ilvaite, the temperature region 110 to 130 K was examined in detail (Table 3, series |  | | Journal (article/letter/editorial) | | pyroxene (not lawsonite) and additional quartz, hematite, titanite, and phengite. Albite-chlorite constitute...SiO2. H20 is taken as excess. Additional quartz, hematite and phengite Blue Amphibole-Albite-Chlorite...P. de Roever and Nijhuis, 1964; Switzerland, van der Plas, 1959 ; New Caledonia, Black, 1974; Calabria)...Monatsh. 1975, 145-162 Plas, L. van der: Petrology of the northern Adula region, Switzerland, with particular...Gen. XVI, 385 393 (1956) Roever, W.P. de: Overdruk van tektonische oorsprong of diepe metamorfose ? Koninkl |  | | Journal (article/letter/editorial) | | margin setting, such as those of the Western Pacific region. Introduction The Anti-Atlas Mountains of southern...rocks. Field relations suggest that the Saghro region constitutes a Proterozoic magmatic arc that developed...with a Late Proterozoic arc to the north (Saghro region). The Bou Azzer erosional inlier (Fig. 2) is located...metadiabases, alkalic pillow basalts, carbonate rocks, hematite-rich argillites, amphibolites, and psammitic quartz-mica...members of the Tiddiline Formation occur in this region and are closely- to tightly-folded about NW-SE |  | | Book | | Dr. Werner Smykatz-Kloss Mineralogisches Institut der Universitiit 7500 Karlsruhe/W. Germany Volumes 1...mineral in a sample by means of the DT A method" (V AN DER MAREL, 1956); or: "Finer distinctions and hence total...above-quoted statements of G. MULLER, LIPPMANN or VAN DER MAREL. With regard to mineralogy, the best textbooks...intentions of BARSHAD, D' ANS-LAX, WIEDEMANN and VAN TETs, and SMYKATZ-KLOSS (1967 b). The determination...points (e.g., those of metals, see WIEDEMANN and VAN TETS) has to be made in graphite crucibles with thermocouples |
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