 | | Journal (article/letter/editorial) | | Geology and Geophysics, University of Wisconsin-Madison, Madison, Wisconsin,53706, U.S.A. (Received 10 August...Other members A. Alietti (Italy), G. W. Brindley (USA), M. L. L. Formosa (Brazil), K. Jasmund (FRG), J...dioctahedral and trioctahedral sub-groups. Each sub-group in turn is divided into mineral species. This subdivision...respects. Smectite has now been accepted as the group name for clay minerals with layer charge between...alternate dual name ofmontmorillonite-saponite for the group. Dual names still exist for the kaolinite-serpentine |  | | Journal (article/letter/editorial) | | and Geophysics U niv er sity of Wisconsin- M adis on Madison, Wisconsin 53 706 Introduction This summary...consideredevery three yearsat the Inter- groups.Each sub-group in turn is divided into minnational Clay Conferences...Minerals and Mineral has now been accepted as the group name for clay Names of the IMA (International Mineralogical...R. A. Rausell-Colom(Spain), and saponitefor the group. Dual namesstill exist for the !U.K.), B. B. Zvyagin...phyllosilicates related to clay minerals Type 1:1 Group (x=charge per unlt) fornula halloysite dickite |  | | Journal (article/letter/editorial) | | White Mountain National Forest, Albany, Carroll County, New Hampshire. Whereas Government Pit gained local...mineral collectors were working Government Pit (Buckley, 1974); and soon topaz, quartz, and feldspar specimens...coauthored “The Weeks Pegmatite Mine, Wakefeld, Carroll County, New Hampshire” (Rocks & Minerals, March/April1991)...is left. Figure 5: Bavenite on albite; crystal group approximately 2 mm; Bob Janules specimen and photo...has been found on quartz and a member of the mica group, its typical matrix is microcline. Other associations |  | | Report (volume) | | anonymous papers, placed at the end of Part I Co. county cos. · counties CORPORATE AUTHORS. Am G American...Wash G S Washington Geological Survey Wis G S Wisconsin Geological and Natural History Survey Wyo St G...93; Marcou, 96; Walcott, 07 Agate Spring fossil quarry, Nebr.: Peterson, 06b, 09 Age fiow and ebb of the...Post-Eocene formations: Smith (E A), 94d 06a Ripley group: Johnson (L C), 84 Rome quadrangle: Hayes, 02 ....C), 45, 45a Bourgueticrinus alabamensis, Ripley group: De Loriol, 82 Calyptraphorus: Conrad, 57b Cambrian |  | | Journal (volume) | | an alkaline syenite pegmatite at Allt a’ Mhullin Quarry, Assynt, Sutherland, Scotland Stephen Moreton ...Cotterell and Michael S. Rumsey 17–23 Ganophyllite-group minerals from the manganese mines at Rhiw, Pen Llŷn...near Caernarfon, in Gwynedd, while ganophyllite-group minerals are described from the Lleyn Peninsula...dealer and teacher Alexander Rose (1781–1860) and a group of his students, the Society was now somewhat moribund... Figure 1. Heulandite. Crystals to 1 cm, with chlorite, on basalt, Kilmacolm, Renfrewshire. Heddle Collection |  | | Journal (article/letter/editorial) | | respects. Smectite has now been accepted as the group name for clay minerals with layer charge between...alternate dual name of montmorillonite-saponite for the group. Dual names still exist for the kaolinite-serpentine...should not be used. The second change is to treat chlorite as consisting of a 2:1 layer plus an interlayer...layer type. This emphasizes the similarity of chlorite to other clay minerals containing interlayer material...for phyllosilicates related to clay minerals. Group (x = charge per formulaunit) Subgroup Species1 |  | | Report (volume) | | P., 15. California, Barstow quadrangle: Trenton group, Ordovician: Bowen, O. E., Jr. , 5. Clark, T. H...4. also Limestone; Dolomite; Western, Claiborne group: Miss. Phosphate. Geol. Soc., 2. California: Calif...described. Div. Mines, 1; Jenkins, O. P., Choctaw County, Highway 17 area: 3. Toulmin, L. D., Jr., 3. Minor:...analysis: KelH. D., 5. ler, W. D., 3. Talladega County, hematiteOklahoma, potash agstone, granite magnetite...ground water: Powham, C. E. ell, W. J., 4. Marengo County: Newton, J. G., 1. Core-drilling program, ChattanooMica: |  | | Report (issue) | | 31 University of Nevada Press, Reno, Nevada 89557 USA Copyright © 2004 by University of Nevada Press Photographs... Majuba Hill Mine, Antelope district, Pershing County. N. Prenn collection. Photograph by J. Scovil....Goodsprings (Yellow Pine) Mining District, Clark County John C. Kepper 91 References 467 Contributors...Descloizite Cuprite on Copper Nevadaite, Gold Quarry Mine Vanadinite, Ruth Mine Epidote Opal after...Humboldt County and the crystalline quartz collecting area on Petersen Mountain in Washoe County, permission | | | Report (issue) | | 3i University of Nevada Press, Reno, Nevada 89557 USA Copyright© 2004 by Uni versity of Nevada Press Photographs... Majuba Hill Mine, Antelope district, Pershing County. N. Prenn coJlection. Photograph by J. Scovil....Goodsprings (Yellow Pine) Mining District, Clark County John C. Kepper MINERAL CATALOG 91 121 Gregory...Millerite Mi1netite Naumannite Ncvadaite, Gold Quarry Mine ()pal after wood Opal, faceted Orpin1ent,...Hurnbo ldt County and the crystalline quartz collecting area on Petersen Mounta in in Washoe County, permission |  | | Journal (article/letter/editorial) | | by ICPAES, Leco C/S125 and XRD. Phosphate and chlorite show mid-REE enrichment; muscovite + biotite shows...mid-REE depletion. The complementarity of the chlorite and muscovite + biotite patterns may be due to...relationship between muscov i t e + b i o t i t e and chlorite (see below) may be accentuated by this constraint...index of chlorite, although it probably includes contributions from chlorite/smectite and chlorite/vermiculite...(muscovite+biotite), 6.39A (albite) and 14.4A (chlorite). Results Fig. 1 is a variate plot on the first |  | | Journal (article/letter/editorial) | | This article deals with that portion of San Miguel County extending from north of Telluride beginning at...origins in the establishment of county lines when San Miguel County was created in 1883. Geologically...mining district of Ouray County and the Silverton caldera of San Juan County. It should be noted that...that before the creation of San Miguel County, the Telluride district was called the Upper San Miguel district...on the Triassic-aged Dolores Formation at Ingram Falls. Here the erosional surface represents the removal |  | | Report (volume) | | and gas possibilities of the basins of the Sierra County region, in N. Mex. Geol. Soc., Guidebook of south-central...diorite pegmatite near Camp Irwin, San Bernardino County, California: Am. Mineralogist, v. 40, nos. 5-6...investigations in the Hockley salt dome, Harris County, Texas: Geophysics, v. 20, no. 4, p. 829-840, illus...deposits of the Sinsinawa River area, Grant County, Wisconsin: U. S. Geol. Survey Mineral Inv. Field Studies...the south flank of the Seminoe Mountains, Carbon County, Wyoming [abs.]: Geol. Soc. America Bull., v. 66 |  | | Book | | are defined by chemical composition, structural group, and crystal system, with one or two references...Si04) and fayalite (Fe 2 Si0 4 ) (see Olivine Group), group names, such as mica for all the minerals with...pyrite) and also to a group of minerals having the same structure pyrite group). kind of mineralogic...sense that does not refer to a mineral species or group proper, no special designating valid mineral species...2 4 ), a mineral species assigned to the spinel group because of its spinel structure; quartz syenite |  | Pinto, Victor Hugo G., Manatschal, Gianreto, Karpoff, Anne Marie, Ulrich, Marc, Viana, Adriano R. (2017) Seawater storage and element transfer associated with mantle serpentinization in magma-poor rifted margins: A quantitative approach. Earth and Planetary Science Letters, 459. 227-237 doi:10.1016/j.epsl.2016.11.023 | Journal (article/letter/editorial) | | other hydrated minerals such as talc, brucite, chlorite or clays may influence the water budget as well...serpentinization of ≤10% (Group 1: weakly serpentinized), samples in the interval 10 to 60% (Group 2: moderately...and samples more than 60% serpentinized (>60%), (Group 3: highly serpentinized). The gain or loss of elements...all the samples by the following relationships: Group 1 (weakly serpentinized) were assumed to represent...from Group 1 to Group 2 (moderately serpentinized); and the transformation from Group 2 to Group 3 (highly |  | | Journal (article/letter/editorial) | | process (T, f O2 and f S2) were obtained from the chlorite solid-solution model of Walshe (1986). Geological...magnetite forms the groundmass for the quartz. Chlorite occurs as sheets of dierent grain sizes which...notation relative to the SMOW standard (Craig 1961). Chlorite has been identi®ed by standard X-ray techniques...analyses of chlorite, selected samples of rock were prepared as polished thin sections, and chlorite was described...metamorphic conditions rather than primary conditions. Chlorite The results of individual analyses of chlorites |  | | Book (edition) | | Index have been read and commented on by H.A. Buckley, G. Cressey, V.K. Din, J.G. Francis, M.M. Grady...File, 1601 Park Lane. Swarthmore, Pennsylvania, USA. Introduction This volume is the third edition...belongs to a broader group of related minerals, the name adopted for the group is given beneath the formula...editions of this book. Brieny. within each anionic group the minerals arc arranged in order determined by...those of the alkaline earths, etc. Within each group the minerals are tabulated with increasing anion |  | | Book | | variety amethyst, sceptre habit, Denny Mountain, King County, Washington, U.S.A. / Photo by Ken Mayer Production...the individuals who made crystallographic space-group, and references to the the discoveries, and scientists... to shine, yellow Gk. chloros, green-yellow chlorite, chlorophyll gre-no, grain lat. granum, grain...classifications were less than successful, and as a distinct group of minerals and proposed the basic often confusing...to name the new mineral in honor of a person or group, to identify the locality where the mineral was |  | | Journal (article/letter/editorial) | | mixedJayer chlorite/smectite (ca. 25o/o chlorite) through different types of regular mixed-layer chlorite/smectite...(ca. 60, 65, 80, and 850/ochlorite) to discrete chlorite has been identified in basalts affectedby low-grade...several types of regular mixedJayer chlorite/smectite as well as chlorite suggeststhat the transition betweenthese...the lo range reported by Frey et al. (1991) for chlorite in low-grade metamorphic areasfrom 19 different...different literature sources. Such variation in chlorite composition is one of the causesof considerableoverlap |  | | Report (issue) | | ....... ...... Illinois, Iowa, Kentucky, and Wisconsin ................... Upper Mississippi Valley district................. 43. Illinois, Iowa, Kentucky, Wisconsin, and southeastern Missouri .....................rarely, pyrite, fluorite, barite, siderite, opal, chlorite, and apatite. These minerals occur either disseminated...silicification of the host rock; and (3) late the large group of minerals that were 16 JASPEROID IN THE UNITED...emplaced after the initial silicification; this group includes both minerals deposited from late hypogene |  | | Report (issue) | | Modifications 221 Chert, chalcedony, etc 222 Hematite group 223 Corundum, hematite, and ilmenite 223 Corundum... Occurrence 227 Alterations 227 228 Spinel group Spinel, magnetite, and chromite 228 228 Spinel... Occurrence 229 Alterations 230 230 Entile group Rutile, octahedrite, and brookite 230 Occurrence...Occurrence 230 Alterations 230 231 Diaspore group Diaspore and limonite 231 232 Diaspore Occurrence...Continued. mineral.-' Continued. Continued. group Brucite and gibbsite '-* Brucite Occurrence |  | | Journal (article/letter/editorial) | | groups A, B, and C. Geochronological data from the group A dikes yielded a Sm–Nd age of 1448 ± 49 Ma. Emplacement...from these dikes and a group C dike yield antipodal magnetizations with a group-mean direction of D =...Supergroup. 40 Ar/39 Ar dates from geochemical group B dikes are consistent with published U–Pb dates...magmatic event. Hornblende concentrates from the group B dikes yield 40 Ar/39 Ar apparent ages of 778–772...date of 788 Ma. Paleomagnetic results from the group B dikes yield a mean direction of D = 301.5◦ , I |  | | Book | | ........................... 529 G: gadolinite group to gyrolite ......................... 226 X: xanthiosite...onNewMinerals,Nomenclature andClass::ication. Co. County. EMPElectronmicroprobe - an instrument usedto ...further 154 species are unconfirmed. If all the group, series, variety and discredited species names are...with older fluorite specimens from Weardale in County Durham being a case in point. Many of these specimens..."Cumberland", "Alston" or "Alston Moor" (Cumberland as a county no longer exists, as it was merged with Westmorland |  | | Book | | grouped like the petals of a flower. Cleveland County, Oklahoma. Minerals Past and Present (75 percent)...GROUPS. The unique arrangement of atoms in such a group provides a characteristic mineral structure. A few...Brazil. TOPAZ: APATITE: 550-pound crystal; Ottawa County, Quebec, Canada. Crystal Faces The regular, smooth...single crystal and are frequently coated with chlorite, clay, or hematite. Changes in the color of a... Mn82 X D 0.53 With surface alteration of chlorite. Form: (d) dodecahedron (12 rhombshaped faces) |  | | Book | | virtue of their chemistry where a discussion of the group properties is relevant. In addition to these cases...categories are used to group related terms that appear at the foot of each entry. The ‘Group’ category (bold...an inorganic base). ACETATE GREEN Flavonoids group; Quercitron Harley (1982) 115 ACCROIDES Red-Orange-Yellow...(Buxbaum, 1998). Carbon-based blacks group: Flame carbons sub-group; Thermal black Buxbaum (1998) 159–160;...compound Actinolite is a green fibrous amphibole group (q.v.) mineral of composition Ca2(Mg,Fe2)5Si8O22(OH)2 |  | | Book (edition) | | minerals. An interesting case in point concerns a group of lead oxychloride minerals from Laurium, a town...indicated. The term industrial mineral embraces another group of minerals of economic importance. This term may...for growing crystals are described in detail by Buckley (1951). The quality of the plane surfaces varies...symbols indicates why it is general practice to group the 32 crystal classes into six or seven crystal...indefinitely in three dimensions. The repeating group of atoms consists of a small parallelepiped, called |
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