Maine the Way Life Should Be. Mineral Collecting
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Geology Club Mineral: Collecting Trip
Geology Club: Mineral Collecting Trip (10 October 2009) Trip Notes by Charles Merguerian STOP 1 – Grossular Garnet Locality, West Redding, Connecticut. [UTM Coordinates: 630.71E / 4575.38N, Bethel quadrangle]. Covering roughly 60 acres of land, this enigmatic massive fine-grained grossularite garnet + diopside rock in West Redding has made many mineral collectors and geologists take notice. Walk up the steep slope east of Simpaug Turnpike to see highly fractured, massive cinnamon-colored grossular garnet rock, part of a 0.6-km wide heart-shaped mass found at the faulted contact between the Stockbridge Marble (OCs) and injected muscovitic schist of the Rowe Schist member (OCr) of the Hartland Formation (Figure 1). According to Rodgers et al. (1985), we are very near Cameron’s Line (red and black line in Figure 1). Figure 1 – Geologic map of the area surrounding Stop 1 showing the Proterozoic gneissic rocks (Yg) and Cambrian Dalton Schist (Cd) to the west, the Stockbridge Marble (OCs), Cameron’s Line (CL in red), the injected schistose rocks of the Rowe Formation (OCr), and an Ordovician granitoid (Og) that may be responsible for this unusual Ca++-enriched skarn deposit. Note the NW-trending high-angle brittle faults that cut the region. (Adapted from Rodgers et al. 1985.) Two knolls at this locality are almost entirely composed of grossularite garnet (var. essonite) and lesser clinopyroxene. Mostly the garnet occurs alone with minor quartz and localized quartz veining has been observed. Chemical analysis of the garnet (SiO2 = 39.10%, CaO = 34.85%, Al2O3 = 19.61%, and total FeO+Fe2O3 = 5.44%), are quite similar to published analyses of grossular garnet, including the phenomenal grossular garnet crystals from Morelos, Mexico. -
Mineral Collecting Sites in North Carolina by W
.'.' .., Mineral Collecting Sites in North Carolina By W. F. Wilson and B. J. McKenzie RUTILE GUMMITE IN GARNET RUBY CORUNDUM GOLD TORBERNITE GARNET IN MICA ANATASE RUTILE AJTUNITE AND TORBERNITE THULITE AND PYRITE MONAZITE EMERALD CUPRITE SMOKY QUARTZ ZIRCON TORBERNITE ~/ UBRAR'l USE ONLV ,~O NOT REMOVE. fROM LIBRARY N. C. GEOLOGICAL SUHVEY Information Circular 24 Mineral Collecting Sites in North Carolina By W. F. Wilson and B. J. McKenzie Raleigh 1978 Second Printing 1980. Additional copies of this publication may be obtained from: North CarOlina Department of Natural Resources and Community Development Geological Survey Section P. O. Box 27687 ~ Raleigh. N. C. 27611 1823 --~- GEOLOGICAL SURVEY SECTION The Geological Survey Section shall, by law"...make such exami nation, survey, and mapping of the geology, mineralogy, and topo graphy of the state, including their industrial and economic utilization as it may consider necessary." In carrying out its duties under this law, the section promotes the wise conservation and use of mineral resources by industry, commerce, agriculture, and other governmental agencies for the general welfare of the citizens of North Carolina. The Section conducts a number of basic and applied research projects in environmental resource planning, mineral resource explora tion, mineral statistics, and systematic geologic mapping. Services constitute a major portion ofthe Sections's activities and include identi fying rock and mineral samples submitted by the citizens of the state and providing consulting services and specially prepared reports to other agencies that require geological information. The Geological Survey Section publishes results of research in a series of Bulletins, Economic Papers, Information Circulars, Educa tional Series, Geologic Maps, and Special Publications. -
ROCK TALK Fax: 520-322-6031 E-Mail: [email protected] January – February 2012 Website: Volume 6, Issue 3
Tucson Gem and Mineral Society, Inc. PO Box, 42588, Tucson, Arizona 85733 Ph: 520-322-5773 ROCK TALK Fax: 520-322-6031 E-mail: [email protected] January – February 2012 Website: www.tgms.org Volume 6, Issue 3 President’s Page President’s Page … CONTINUED Greetings to all of our members and those members that contributed with hoping you had a wonderful Holiday donations to the Community Food Bank and Season with your friends and family. the Tucson Firefighters Toy Drive. This is an Lots of love, fun and food to remind attempt to, not only help the families of us of how fortunate we are and how Tucson, but give the Tucson Gem and Mineral Society a positive image in our community. much we appreciate each other and all our blessings. Now we This is so important to our being considered have a New Year approaching and an important part of Tucson, we are more a time of renewal and resolutions. than a Show, we are a responsible and viable Time to reflect and get busy in 2012. resource that can and should be appreciated We have a lot to do. all year. The Show is fast approaching and our volunteers So, the New Year is upon us, lets learn from and staff are hard at work just trying to get the past and take that knowledge into the everything ready for one of the best Shows we future to make better choices and decisions. have ever sponsored. “Minerals of Arizona” Thank you all for being a part of our Society promises to bring to our visitors and dealers an and now, lets "get on with the Show!!!!” opportunity to be a part of a very special event. -
Microlites and Associated Oxide Minerals from Naipa Pegmatites – Alto Ligonha – Zam- Bezia - Mozambique
MICROLITES AND ASSOCIATED OXIDE MINERALS FROM NAIPA PEGMATITES – ALTO LIGONHA – ZAM- BEZIA - MOZAMBIQUE C. Leal Gomes, C.1 Dias, P.A.1 Guimarães, F.2 Castro, P.2 1 Universidade do Minho – CIG-R – Escola de Ciências – Gualtar - 4710-057 Braga, Portugal 2 LNEG – Rua da Amieira – 4465 S. Mamede de Infesta , Portugal Keywords: Alto Ligonha pegmatite district, LCT- pegmatite, U-Pb-Ba-Bi-Sb-microlite Naipa granitic pegmatites of LCT or a nuclear quartz+cleavelandite unit type, located in Alto Ligonha Pegmatite with miarolitic pockets. Pegmatites seem District, Monapo-Mocuba belt, Zambezia to be genetically related to Pan-African Pegmatite Province (Mozambique), biotite-amphibolic granites (zircon hosted are mined for tantalum and gemstones in lepidolite was dated 482±10 MA - U/ (topaz, OH-herderite; tourmaline and Pb). In the Northern Sector of Naipa mine, beryl). They are structurally complex, the internal zones are better defi ned, while concentrically zoned, intruding chlorite in the Southern domain, at least four and amphibole phyllites and gneisses. stages of hydrothermal alteration mask Internal units include wall zone (Mn- the primary structures in the outer and almandine line-rock), several intermediate inner intermediate zones. Two dilatation zones (K feldspar, albite, muscovite, episodes produced pegmatite veinlets, well spodumene) and a quartz±lepidolite core expressed in the Southern Sector (Fig.1). Estudos Geológicos v. 19 (2), 2009 167 MICROLITES AND ASSOCIATED OXIDE MINERALS FROM NAIPA PEGMATITES – ALTO LIGONHA – ZAMBEZIA - MOZAMBIQUE -
EGU2016-11594, 2016 EGU General Assembly 2016 © Author(S) 2016
Geophysical Research Abstracts Vol. 18, EGU2016-11594, 2016 EGU General Assembly 2016 © Author(s) 2016. CC Attribution 3.0 License. Isotope age of the rare metal pegmatite formation in the Kolmozero-Voron’ya greenstone belt (Kola region of the Fennoscandian shield): U-Pb (TIMS) microlite and tourmaline dating Nikolay Kudryashov, Ludmila Lyalina, Artem Mokrushin, Dmitry Zozulya, Nikolay Groshev, Ekaterina Steshenko, and Evgeniy Kunakkuzin Geological Institute of the KSC RAS, Apatity, Russian Federation ([email protected]) The Kolmozero-Voron’yagreenstone belt is located in the central suture zone, which separates the Murmansk block from the Central-Kola and the Keivy blocks. The belt is represented by volcano-sedimentary rocks of Archaean age of 2.9-2.5 Ga. Rare metal pegmatites (Li, Cs with accessory Nb, Ta, and Be) occur among amphibolite and gabbroid intrusions in the northwestern and southeastern parts of the belt. According to the Rb-Sr data, the age of pegmatites was considered to be 2.7 Ga. Until recently there was no generally accepted point of view on the origin of pegmatites. Now we have isotopic data for a range of rock complexes that could pretend to be parental granites for the rare metal pegmatites. These are granodiorites with the zircon age of 2733±Ma, and microcline and tourmaline granites, which Pb-Pb isochronal age on tourmaline from the tourmaline granite located near the deposit is estimated to be 2520±70 Ma. The pegmatite field of the Vasin Myl’k deposit with the lepidolite–albite– microcline–spodumene–pollucite association is located among amphibolites in the northwestern part of the belt. -
Geochemical Alteration of Pyrochlore Group Minerals: Microlite Subgroup Gnrconv R. Luurpxrn Roonev C. Ewruc Ansrru.Cr
AmericanMineralogist, Volume 77, pages l,79-188,1992 Geochemical alteration of pyrochlore group minerals: Microlite subgroup Gnrconv R. LuurpxrN Advanced Materials Program, Australian Nuclear Science and Technology Organisation, Private Mail Bag I, Menai, New South Wales 2234, Ans1nalla RooNev C. Ewruc Department of Geology, University of New Mexico, Albuquerque, New Mexico 87131, U.S.A. Ansrru.cr A qualitative picture of microlite stability is derived from known mineral assemblages and reactions in the simplified system Na-Ca-Mn-Ta-O-H. Results suggestthat microlite is stable under conditions of moderate to high 4*"* and aq^z*and low to moderate 4rnz*. Microlite is often replaced during the latter stagesof granitic pegmatite evolution by man- ganotantalite and fersmite or rynersonite, indicating increasingdq^z* ?fid 4Mn2*relative to a*.-. Primary (hydrothermal) alteration involves replacementof Na, F, and vacanciesby Ca and O, representedby the coupled substitutions ANaYF- ACaYOand AtrY! - ACaYO. Exchangereactions between microlite and fluid suggestconditions of relatively high pH, high aa,^z*,lowto moderate a.r, and low a".. during alteration by evolved pegmatite fluids at 350-550'C and 2-4 kbar. Secondary(weathering) alteration involves leaching ofNa, Ca, F, and O, representedby the coupled substitutions ANaYF - AEY!, ACaYO- AEYII and ACaxO - Alxfl. Up to 800/oof the A sites may be vacant, usually accompaniedby a comparablenumber of anion (X + Y) vacanciesand HrO molecules.Secondary alteration results from interaction with relatively acidic meteoric HrO at temperatures below 100 "C. In both types of alteration, the U content remains remarkably constant.Loss of radio- genic Pb due to long-term difftrsion overprints changesin Pb content associatedwith primary alteration in most samples. -
Crystallization Processes and Solubility of Columbite-(Mn), Tantalite-(Mn), Microlite, Pyrochlore, Wodginite and Titanowodginite in Highly Fluxed Haplogranitic Melts
Western University Scholarship@Western Scholarship@Western Electronic Thesis and Dissertation Repository 3-12-2018 10:30 AM Crystallization processes and solubility of columbite-(Mn), tantalite-(Mn), microlite, pyrochlore, wodginite and titanowodginite in highly fluxed haplogranitic melts Alysha G. McNeil The University of Western Ontario Supervisor Linnen, Robert L. The University of Western Ontario Co-Supervisor Flemming, Roberta L. The University of Western Ontario Graduate Program in Geology A thesis submitted in partial fulfillment of the equirr ements for the degree in Doctor of Philosophy © Alysha G. McNeil 2018 Follow this and additional works at: https://ir.lib.uwo.ca/etd Part of the Earth Sciences Commons Recommended Citation McNeil, Alysha G., "Crystallization processes and solubility of columbite-(Mn), tantalite-(Mn), microlite, pyrochlore, wodginite and titanowodginite in highly fluxed haplogranitic melts" (2018). Electronic Thesis and Dissertation Repository. 5261. https://ir.lib.uwo.ca/etd/5261 This Dissertation/Thesis is brought to you for free and open access by Scholarship@Western. It has been accepted for inclusion in Electronic Thesis and Dissertation Repository by an authorized administrator of Scholarship@Western. For more information, please contact [email protected]. Abstract Niobium and tantalum are critical metals that are necessary for many modern technologies such as smartphones, computers, cars, etc. Ore minerals of niobium and tantalum are typically associated with pegmatites and include columbite, tantalite, wodginite, titanowodginite, microlite and pyrochlore. Solubility and crystallization mechanisms of columbite-(Mn) and tantalite-(Mn) have been extensively studied in haplogranitic melts, with little research into other ore minerals. A new method of synthesis has been developed enabling synthesis of columbite-(Mn), tantalite-(Mn), hafnon, zircon, and titanowodginite for use in experiments at temperatures ≤ 850 °C and 200 MPa, conditions attainable by cold seal pressure vessels. -
Mineralogy and Geochemical Evolution of the Little Three
American Mineralogist, Volume 71, pages 406427, 1986 Mineralogy and geochemicalevolution of the Little Three pegmatite-aplite layered intrusive, Ramona,California L. A. SrnnN,t G. E. BnowN, Jn., D. K. Brno, R. H. J*rNs2 Department of Geology, Stanford University, Stanford, California 94305 E. E. Foono Branch of Central Mineral Resources,U.S. Geological Survey, Denver, Colorado 80225 J. E. Snrcr,nv ResearchDepartment, Gemological Institute of America, 1660 Stewart Street,Santa Monica, California 90404 L. B. Sp.c,uLDrNG" JR. P.O. Box 807, Ramona,California 92065 AssrRAcr Severallayered pegmatite-aplite intrusives exposedat the Little Three mine, Ramona, California, U.S.A., display closelyassociated fine-grained to giant-texturedmineral assem- blageswhich are believed to have co-evolved from a hydrous aluminosilicate residual melt with an exsolved supercriticalvapor phase.The asymmetrically zoned intrusive known as the Little Three main dike consists of a basal sodic aplite with overlying quartz-albite- perthite pegmatite and quartz-perthite graphic pegmatite. Muscovite, spessartine,and schorl are subordinate but stable phasesdistributed through both the aplitic footwall and peg- matitic hanging wall. Although the bulk composition of the intrusive lies near the haplo- granite minimum, centrally located pockets concentratethe rarer alkalis (Li, Rb, Cs) and metals (Mn, Nb, Ta, Bi, Ti) of the system, and commonly host a giant-textured suite of minerals including quartz, alkali feldspars, muscovite or F-rich lepidolite, moderately F-rich topaz, and Mn-rich elbaite. Less commonly, pockets contain apatite, microlite- uranmicrolite, and stibio-bismuto-columbite-tantalite.Several ofthe largerand more richly mineralized pockets of the intrusive, which yield particularly high concentrationsof F, B, and Li within the pocket-mineral assemblages,display a marked internal mineral segre- gation and major alkali partitioning which is curiously inconsistent with the overall alkali partitioning of the system. -
Alphabetical List
LIST L - MINERALS - ALPHABETICAL LIST Specific mineral Group name Specific mineral Group name acanthite sulfides asbolite oxides accessory minerals astrophyllite chain silicates actinolite clinoamphibole atacamite chlorides adamite arsenates augite clinopyroxene adularia alkali feldspar austinite arsenates aegirine clinopyroxene autunite phosphates aegirine-augite clinopyroxene awaruite alloys aenigmatite aenigmatite group axinite group sorosilicates aeschynite niobates azurite carbonates agate silica minerals babingtonite rhodonite group aikinite sulfides baddeleyite oxides akaganeite oxides barbosalite phosphates akermanite melilite group barite sulfates alabandite sulfides barium feldspar feldspar group alabaster barium silicates silicates albite plagioclase barylite sorosilicates alexandrite oxides bassanite sulfates allanite epidote group bastnaesite carbonates and fluorides alloclasite sulfides bavenite chain silicates allophane clay minerals bayerite oxides almandine garnet group beidellite clay minerals alpha quartz silica minerals beraunite phosphates alstonite carbonates berndtite sulfides altaite tellurides berryite sulfosalts alum sulfates berthierine serpentine group aluminum hydroxides oxides bertrandite sorosilicates aluminum oxides oxides beryl ring silicates alumohydrocalcite carbonates betafite niobates and tantalates alunite sulfates betekhtinite sulfides amazonite alkali feldspar beudantite arsenates and sulfates amber organic minerals bideauxite chlorides and fluorides amblygonite phosphates biotite mica group amethyst -
New Mineral Names*,†
American Mineralogist, Volume 106, pages 1186–1191, 2021 New Mineral Names*,† Dmitriy I. Belakovskiy1 and Yulia Uvarova2 1Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18 korp. 2, Moscow 119071, Russia 2CSIRO Mineral Resources, ARRC, 26 Dick Perry Avenue, Kensington, Western Australia 6151, Australia In this issue This New Mineral Names has entries for 10 new species, including huenite, laverovite, pandoraite-Ba, pandoraite- Ca, and six new species of pyrochlore supergroup: cesiokenomicrolite, hydrokenopyrochlore, hydroxyplumbo- pyrochlore, kenoplumbomicrolite, oxybismutomicrolite, and oxycalciomicrolite. Huenite* hkl)]: 6.786 (25; 100), 5.372 (25, 101), 3.810 (51; 110), 2.974 (100; 112), P. Vignola, N. Rotiroti, G.D. Gatta, A. Risplendente, F. Hatert, D. Bersani, 2.702 (41; 202), 2.497 (38; 210), 2.203 (24; 300), 1.712 (60; 312), 1.450 (37; 314). The crystal structure was solved by direct methods and refined and V. Mattioli (2019) Huenite, Cu4Mo3O12(OH)2, a new copper- molybdenum oxy-hydroxide mineral from the San Samuel Mine, to R1 = 3.4% using the synchrotron light source. Huenite is trigonal, 3 Carrera Pinto, Cachiyuyo de Llampos district, Copiapó Province, P31/c, a = 7.653(5), c = 9.411(6) Å, V = 477.4 Å , Z = 2. The structure Atacama Region, Chile. Canadian Mineralogist, 57(4), 467–474. is based on clusters of Mo3O12(OH) and Cu4O16(OH)2 units. Three edge- sharing Mo octahedra form the Mo3O12(OH) unit, and four edge-sharing Cu-octahedra form the Cu4O16(OH)2 units of a “U” shape, which are in Huenite (IMA 2015-122), ideally Cu4Mo3O12(OH)2, trigonal, is a new mineral discovered on lindgrenite specimens from the San Samuel turn share edges to form a sheet of Cu octahedra parallel to (001). -
The Role and Significance of Pegmatites in the Central Alps. Proxies of the Exhumation History of the Alpine Nappe Stack in the Lepontine Dome
Scuola di Dottorato in Scienze della Terra, Dipartimento di Geoscienze, Università degli Studi di Padova – A.A. 2009-2010 THE ROLE AND SIGNIFICANCE OF PEGMATITES IN THE CENTRAL ALPS. PROXIES OF THE EXHUMATION HISTORY OF THE ALPINE NAPPE STACK IN THE LEPONTINE DOME Ph.D. candidate: ALESSANDRO GUASTONI Tutors: Prof. GILBERTO ARTIOLI, Prof. GIORGIO PENNACCHIONI Cycle:XXIV Abstract The pegmatitic field is located between Domodossola town (Western-Central Alps) and the Masino-Bregaglia Oligocene intrusion (Central Alps) ). Most of the pegmatitic dikes are hosted into the Southern Steep Belt (SSB), an alpine migmatitic unit characterized by high temperature greenschist and amphibolitic facies related to Barrovian metamorphism. Swiss authors aged some aplite-pegmatites between 29-26 m.y. Most of pegmatitic dikes (>90%) are composed by K-feldspar and subordinate quartz+ muscovite. A small population of more “geochemically evolved” population of pegmatites respectively belong to the LCT (lithium, cesium, tantalum) and NYF (niobium, yttrium, fluorine) families. Studies will focuse: to isotopes to define age of crystallizations and rate of coolings of deformed and miarolitic pegmatites; to geochemistry and relate the genesis of Alpine pegmatites to migmatites terrains of the Alpine Barrovian-type metamorphic belt or to granitic-tonalitic liquid melts of Masino-Bregaglia intrusion. Introduction Most of the pegmatitic dikes are hosted by the Southern Steep Belt (SSB), an alpine migmatitic unit, which includes several Lepontine nappes like the Antigorio, the Monte Rosa, the Camughera-Moncucco- Isorno-Orselina and the Adula. Alpine metamorphism in Central Alps is poliphasic and characterized by high temperature greenschist and amphibolitic facies related to Barrovian metamorphism during Oligocene-Miocene age (Burg & Gerya, 2005; Burri et al., 2005; Maxelon & Mancktelow, 2005). -
Extraction and Separation of Tantalum and Niobium from Mozambican Tantalite by Solvent Extraction in the Ammonium Bifluoride-Octanol System
EXTRACTION AND SEPARATION OF TANTALUM AND NIOBIUM FROM MOZAMBICAN TANTALITE BY SOLVENT EXTRACTION IN THE AMMONIUM BIFLUORIDE-OCTANOL SYSTEM by KABANGU MPINGA JOHN Dissertation submitted in partial fulfillment of the requirements for the degree of MSc (Applied Science): Chemical Technology Department of Chemical Engineering Faculty of Engineering, the Built Environment and Information Technology Supervisor: Prof. Philip Crouse University of Pretoria © University of Pretoria DECLARATION I, Kabangu Mpinga John, student No. 28140045, hereby declare that all the work provided in this dissertation is to the best of my knowledge original (excepted where cited) and that neither the whole work nor any part of it has been, or is to be, submitted for another degree at University of Pretoria or any other University or tertiary education institution or examining body. SIGNATURE……………………………………………………………………………………… DATE………………………………………………………………………………………………. KABANGU MPINGA JOHN I SYNOPSIS EXTRACTION AND SEPARATION OF TANTALUM AND NIOBIUM FROM MOZAMBICAN TANTALITE BY SOLVENT EXTRACTION IN THE AMMONIUM BIFLUORIDE-OCTANOL SYSTEM Autor: Kabangu Mpinga John Supervisor: Prof. Philip Crouse Department: Chemical Engineering Degree: MSc (Applied Science): Chemical Technology The principal aim of this research was to determine the optimum conditions of extraction and separation of niobium and tantalum with octanol as solvent, from Mozambican tantalite using ammonium bifluoride as an alternative to hydrofluoric acid. The extraction of niobium and tantalum from tantalite can be divided into three activities, viz., acid treatment of the ore to bring the niobium and tantalum values into solution, separation of niobium and tantalum by solvent extraction and preparation of pure niobium pentoxide and tantalum pentoxide by precipitation followed by calcination. An initial solution was prepared by melting a mixture of tantalite and ammonium bifluoride followed by leaching of the soluble component with water and separation of the solution by filtration.