 | NovĂĄk, Milan, CempĂrek, Jan, Gadas, Petr, Ć koda, Radek, VaĆĄinovĂĄ GaliovĂĄ, Michaela, Pezzotta, Federico, Groat, Lee A. (2015) Boralsilite and Li, Be-bearing "Boron Mullite" Al8B2Si2O19, Breakdown products of spodumene from the Manjaka pegmatite, Sahatany valley, Madagascar. The Canadian Mineralogist, 53 (2) 357-374 doi:10.3749/canmin.1400092 | Journal (article/letter/editorial) | | PRODUCTS OF SPODUMENE FROM THE MANJAKA PEGMATITE, SAHATANY VALLEY, MADAGASCAR MILAN NOVĂK§ Department of...from the elbaite-subtype Manjaka granitic pegmatite, Sahatany Valley, Madagascar. The pegmatite mineral...long, mostly as narrow albite > K-feldspar zones (albite > K-feldspar > boralsilite > âboron mulliteâ)... are mostly enclosed in albite and rarely in K-feldspar. The EMP and LA-ICP-MS data yielded relatively...solidus/early subsolidus, granitic pegmatite, Manjaka, Madagascar. INTRODUCTION Boralsilite, Al16B6Si2O37 |  | | Report (issue) | | The Natural History Museum of Milan and its Madagascar Collection The Museo Civico di Storia Naturale... the museum began paleontologic fieldwork in Madagascar (upper Permian fauna and Jurassic and Cretaceous...fieldwork in Madagascar in 1996 in collaboration with other institu tions in Madagascar, Italy, and the...Pezzotta has spent a total of twenty nine months in Madagascar making geological-mineralogical surveys. In collaboration...both classic and new minerals and gemstones from Madagascar opened at the Natural History Museum in Milan |  | | Journal (article/letter/editorial) | | granitic pegmatites of the Itremo region, central Madagascar Federico Pezzotta In the last decade, in pegmatite...metasedimentary upper unit of the Itremo Group, Central Madagascar (Fernandez et aI., 2001), local mining cooperatives...Ta-Nb borates: 1) central Sahatany valley, south of Antsirabe (pegmatites of Manjaka, 1I0ntsa and Marirana);...Marirana); 2) Manandona valley, south of the Sahatany (pegmatite of Antandrokomby); 3) Manapa-Antsetsindrano...associated with elongated crystals of danburite, K-feldspar, green to pink spodumene, with minor quartz. |  | CempĂrek, Jan, Grew, Edward S., Kampf, Anthony R., Ma, Chi, NovĂĄk, Milan, Gadas, Petr, Ć koda, Radek, VaĆĄinovĂĄ-GaliovĂĄ, Michaela, Pezzotta, Federico, Groat, Lee A., Krivovichev, Sergey V. (2016) VrĂĄnaite, ideally Al16B4Si4O38, a new mineral related to boralsilite, Al16B6Si2O37, from the Manjaka pegmatite, Sahatany Valley, Madagascar. American Mineralogist, 101 (9) 2108-2117 doi:10.2138/am-2016-5686 | Journal (article/letter/editorial) | | boralsilite, Al16B6Si2O37, from the Manjaka pegmatite, Sahatany Valley, Madagascar Jan CempĂrek1, Edward S. Grew2...albite and K-feldspar as a breakdown product of spodumene in the elbaite-subtype Manjaka granitic pegmatite...pegmatite, Sahatany Valley, Madagascar. Boralsilite also occurs in this association, although separately...products of a residual liquid rich in Li, Be, Na, K, and B during a pressure and chemical quench, but...diffusion rates. Keywords: VrĂĄnaite, boralsilite, Madagascar, pegmatite, new mineral, structural complexity |  | | Journal (article/letter/editorial) | | (at Tamponilapa and Tsarafara-Nord, Sahatany Valley, Madagascar) and paragneisses (at CtidruĆŸice, Moldanubian...NovĂĄk Tamponilapa and Tsarafara-Nord, Sahatany Valley, Madagascar and CtidruĆŸice, Moldanubian Zone, Czech...Pegmatite fields of Central Madagascar The pegmatites of the Sahatany Valley pegmatite field are located...north-eastern part of the Itremo Region, Central Madagascar built by low- to medium-grade metamorphic rocks...dominance of elbaite-subtype pegmatites in this district (see Ranorosoa 1986; NovĂĄk et al. 2015a). Mineral |  | Pekov, I. V., Yakubovich, O. V., Massa, W., Chukanov, N. V., Kononkova, N. N., Agakhanov, A. A., Karpenko, V. Y. (2010) Londonite from the Urals, and new aspects of the crystal chemistry of the rhodozite-londonite series. The Canadian Mineralogist, 48 (2) 241-254 doi:10.3749/canmin.48.2.241 | Journal (article/letter/editorial) | | Central Urals, Russia. All are Cs-dominant (Cs > K) and must now be considered londonite. The crystal...solved from single-crystal data collected at 193 K and refined to R = 0.0203. The mineral is cubic, space... Both Cs+ and K+ are ordered in the cages of the quasi-framework. The very short CsâK distance, 0.51(3)...occupancy of these positions in the same cage. The Be and K atoms are also separated by an unallowable short distance...system between rhodizite (K-dominant), londonite (Cs-dominant) and the hypothetical K- and Cs-free analogue |  | | Journal (article/letter/editorial) | | new subtype of the rare-element class M . N o v f i k 1 a n d P. P o v o n d r a 2 i Department of Geological...through a graphic unit to local pods of blocky K-feldspar. Patches of an albitic unit are associated with...schriftgranitischen Zone mit Nestern mit blockigem K-Feldspar. Albit-reiche Zonen die sich im zentralen Teil...Ctidru~ice, Biskupice, Vlast~jovice, Kom/trovice, Jeclov II). However, isolated occurrences also are present...plagioclase + K-feldspar + biotite) which grade inwards, through a locally dominant graphic unit (K-feldspar + quartz) |  | | Journal (article/letter/editorial) | | constituents of the aplite are albite, potash-feldspar, lithian-micas, and quartz in varying amounts...orthoclase, and colourless lithian mica. 444 O. VON K N O R R I N G AND E. C O N D L I F F E (b) 'White...granite pegmatites where the principle potassium feldspar is commonly microcline. Of a large number of African...the exotic Manjaka rubellite-kunzite-rhodizite pegmatite in the Sahatany Valley of Madagascar. The K-feldspar...distinguish, with the naked eye, from the ubiquitous feldspar which they resemble. Amblygonite, like N B - |  | | Journal (article/letter/editorial) | | to cultural timescales M. EBERT1*, K. KANDLER1, C. DEUTSCHER, K. LIEKE1, D. MĂLLER-EBERT1, L. SCHĂTZ2...Germany The Saharan Mineral Dust Experiment II (SAMUM II) is dedicated to the understanding of the radiative...burning events. Iron isotope fractionation during Fe(II) oxidation and precipitation of iron in acid mine...isotope fractionation during the oxidation of Fe(II)aq into Fe(III)aq by A. ferrooxidans was controlled...focused on iron isotope fractionation during the Fe(II) oxidation and the subsequent precipitation of iron |  | Gatta, G. D., Vignola, P., McIntyre, G. J., Diella, V. (2010) On the crystal chemistry of londonite [(Cs,K,Rb)Al4Be5B11O28]: A single-crystal neutron diffraction study at 300 and 20 K. American Mineralogist, 95 (10) 1467-1472 doi:10.2138/am.2010.3554 | Journal (article/letter/editorial) | | londonite [(Cs,K,Rb)Al4Be5B11O28]: A single-crystal neutron diffraction study at 300 and 20 K G. DieGo Gatta...[ideal chemical formula: (Cs,K) Al4Be4(B,Be)12O28; a = 7.3098(2) Ă
at 300 K, space group P43m] from the...pegmatites of the Antsongombato Gem Mine, Betafo district, Madagascar, has been reinvestigated by means of wavelength...diffraction at 300 and 20 K. Single-crystal anisotropic structural refinement at 300 K gave a final agreement...with CN = 12) is mainly occupied by Cs, with Rb and K. The significantly high amount of B2O3 (~50 wt%) and |  | NovĂĄk, M., Prokop, J., Losos, Z., Macek, I. (2017) Tourmaline, an indicator of external Mg-contamination of granitic pegmatites from host serpentinite; examples from the Moldanubian Zone, Czech Republic. Mineralogy and Petrology, 111 (4) 625-641 doi:10.1007/s00710-017-0512-4 | Journal (article/letter/editorial) | | rocks (group A) of anatectic or metasomatic origin, (ii) subhomogeneous to simply zoned barren pegmatite...of pegmatite solidification (NovĂĄk et al. 2012); (ii) post-emplacement stage of contamination of pegmatite...structure in various pressuretemperature conditions, (ii) common occurrence in different stages of pegmatite...orthogneiss, quartzite, amphibolite is overlain by (ii) the Varied group, Tourmaline, an indicator of...2015b): (i) pre-Variscan (metamorphosed) pegmatites; (ii) several types of simple anatectic (abyssal) pegmatites; |  | | Journal (article/letter/editorial) | | hydrothermal beryl II and phenakite II occur in miarolitic pockets (paragenetic type II). Secondary hydrothermal...elevated contents of Na, Cs, Mg, Fe, Sc in beryl I and II; Na, Ca, Mg, Fe, Al in bazzite III; REE in milar...magmatic Be-minerals within a single pegmatite district is exceptional and it is constrained by variable...7 ppm), Cr (270â650 ppm), Cs (20â40 ppm), a high K/Rb (133â171), but low CaO (2.3â4.8 wt. %) and Sr contents...KoĆŸichovice I,II; POZ â PozÄĂĄtky; KLU â KluÄov III; OKR â OkraĆĄovice; CIM â ÄĂmÄĆ I,II; KRA â Kracovice |  | | Journal (article/letter/editorial) | | completely overwhelmed by the vast amounts of quartz, K-feldspar and albite, and the minor amounts of the hydrous...leucosomes with a pegmatitic texture. Quartz and K-feldspar in particular can reach very coarse grain-sizes...in leucosome is quartz + sodic plagioclase + K-feldspar + muscovite + garnet + biotite ± apatite ± beryl...development of a negative europium anomaly as feldspar is removed; at the same time, the melt can be...the growth of anhydrous minerals like quartz and feldspar on the walls. Relatively rapid coalescence of |  | ÄopjakovĂĄ, Renata, Prokop, JiĆĂ, NovĂĄk, Milan, Losos, ZdenÄk, Gadas, Petr, Ć koda, Radek, HolĂĄ, MarkĂ©ta (2021) Hydrothermal alteration of tourmaline from pegmatitic rocks enclosed in serpentinites: Multistage processes with distinct fluid sources. Lithos, 380. 105823pp. doi:10.1016/j.lithos.2020.105823 | Journal (article/letter/editorial) | | compositional/paragenetic types are defined: Ca,Mg-, Na,K,Mg-, K,Mg- and K,Nadominant. Sources of fluids include (i)...pegmatite melt (Na, K, Ca, ± Li), particularly in the more evolved pegmatites, and (ii) fluids infiltrated/diffused...quartz and tourmaline of as well as common late K-feldspar, zeolites, arfvedsonite, and minor smectite suggests...Oslavany II) and more evolved, complexly zoned pegmatite dikes with Be -p minerals (VÄĆŸnĂĄ II, VÄĆŸnĂĄ I);...calc-silicate rocks. Both ro groups are overlain by (ii) the structurally highest Gföhl Unit comprising felsic |  | | Book | | 80 Emerald and 140 Beryls, as Founda- Part II 86 87 Birthstones, Beryl in India, CHEMICAL AND... Japan, 462 Switzerland, 510 Tanzania 463 Madagascar (Malagasy Republic), Malawi Nepal, 482 513...of cultural the present work astrological Part II lesser extent, a of part to knowledge has been...Vienna, Angeles, CA; Oceanside, York, Roland Dr. K. CA; Milton Switzerland; Hans Stern, Austria; the...derived from erald. 5 M. but C. . which to II in the searched the literature for references to |  | | Journal (issue) | | Rhodizite-Londonite from the Antsongombato Pegmatite, Central Madagascar Brendan M. Laurs, Federico Pezzotta, William...Process ratified âą Alexandrite from Mananjary, Madagascar âą Colorchange apatite from Kazakhstan âą New emerald... Spring 1987 issue of Ornament magazine (see R. K. Liu, âMaterial in ancient and ethnic jewelry from...right is a hornbill âivoryâ ojime. Photos by Robert K. Liu; courtesy of and © 1977 Ornament magazine. IN...68); and Steve Ulatowski of New Era Gems, Grass Valley, California, for the before-and-after sample of |  | | Journal (article/letter/editorial) | | associated with ïŹne-grained albite and blocky K-feldspar is commonly oriented subnormal to the contact...crystals of spodumene occur in massive quartz or feldspar-rich intermediate units (Walker et al. 1986; Mulja...are commonly associated with albite, quartz, K-feldspar, colored elbaite, pink beryl, muscovite and/or...(Si), rhodonite (Mn), hornblende (Ti), sanidine (K, Al), olivine (Mg) and chromite (Cr). The analytical...limits are: 0.02 for Ti, Cr and Mg; 0.03 for Na, Ca, K and Al; 0.04 for Fe and Si and 0.05 for Mn (all in |  | | Book | | -~~1---------- 1960-2015 by Thom.as P. Moore Volume II I-Z Published by the Mineralogical Record, Inc....Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...massive calcite. or, rarely, still attached to the feldspar/mica walls of the dike (www.davidkjoyceminerals...crystals of rutile (Weerth, 2004). Tonniq Valley, Skardu district, Gilgit-Baltistan [Northern Areas]. Beginning...region of Alpine-type clefts along the Torrniq Valley produced small numbers of ilmenite specimens reminiscent |  | Dittrich, Thomas, Seifert, Thomas, Schulz, Bernhard, Hagemann, Steffen, Gerdes, Axel, PfĂ€nder, Jörg (2019) Archean Rare-Metal Pegmatites in Zimbabwe and Western Australia - Geology and Metallogeny of Pollucite Mineralisations. Springer International Publishing. doi:10.1007/978-3-030-10943-1 | Book | | . . . . . . . . . 2.3.2 The Wodgina Pegmatite District in the Pilbara Craton References . . . . . . ...properties similar to other alkali metals like Rb or K, with a large ionic radius of 1.65 Ă
, and belongs...potential, it is far more reactive than Li, Na or K and still pronouncedly more reactive than Rb. When...other alkali metals as Na, K or Rb, it occurs as trace element in feldspar or mica. Certain geological...are very rare. Among the major elements, only the K can be substituted by Cs (CÌernĂœ et al. 1985). As |  | | Report (volume) | | 441-443: Occurrences of kornerupine sensu stricto (K) and prismatine (P) Chapter 9. Table 17, pp. 461-462:...formation The system Ca-Mg-B-Si-O-H-Cl-S The system K-Na-B-Si-O-H-F-N Other chemical systems Heat-capacity...exploration guide Geochronology Involving Tourmaline K-Ar and ^Ar/S^Ar systematics Rb-Sr geochronology Sm-Nd...High-spatial-resolution EELS Interpretation of the B K ELNES Molecular Orbital (MO) approach Multiple scattering...Rosenberg, Werner Schreyer, Denis M. Shaw, Charles K. Shearer, Virginia B. Sisson, John F. Slack, Michael | | | Report (volume) | | MATHEMATICAL CRYSTALLOGRAPHY 16 1986 570 J.W. Valley H.P. Taylor, Jr. J.R. O'Neil STABLE ISOTOPES IN...Table 17, pp. 461-462: B,03 contents sensu stricto (K) and prismatine of rock-forming (P) silicate minerals...mmriaeiosle BSE LCLON CES ss 1 pa ote teee sae cen k ts So TRe La ar Net On RI cs Seid Chapter 6 193...Quaternary sodium-calciunr borate deposits 220.020. 32). ii. oo. ewntep cena tecviods 275 Quaternaryspditim-borate...bare: ee dh tesa nc a cee ie eee BOrOSUICALS MENS ii. css oc nenece ones ene oe ae eee en eae eee Boron-bearing |  | | Book (edition) | | archetype 2J Sulfosalts of PbS archetype 2.K Sulfarsenates )K zh zhemchuzhnikovite 3. Halides w !>h...H Vanadatcs 4J Arsenite!, and similar compounds 4.K Iodates -- - ---------,-. . r 9 5. Carbonates...dept. (departement), dept. (departamento), dist. (district). Less common terms are not abbreviated, e.g....byssolite. Mono- coast of North America: Kobuk River Valley, Alaska, clinic, C2/m, a,b,c = 9.89, 18.20, 5.31...e.g. on Grossgreiner Mt., overlooking Zillertal Valley, Tirol, Austria, and at Passo di Vizze, Trentino-Alto |  | | Book | | Tantalum-Congresses. 3. Niobium-Congresses. I. Möller, P. (Peter) II. Cerny, P. III. Saupe, Francis. IV. Series: Special...with 8 Figures) . . . . . . . . . . . . . 80 Part II Geochemistry REE (Y), Nb, and Ta Enrichment in Pegmatitesand...Bastnaesite-Fluorite-Barite Deposit of the Kizilcaören District, Eskisehir, Turkey. G. Morteani and M. Satir (with...Granite-Hosted Tantalum Deposits: An Approach via District Analysis. P. 1. Pollard (with 1 Figure) . . .... 9 Mineralogy of the Rare-Earth Elements 0 A K+ 1.5 Ba2+,02- 1.4 1.3 Pb2+ Sr2+ * 2+ * 1.2 |  | | Book (edition) | | cm. ISBN 0-442-27681-8 1. MineralogyâDictionaries. II. Rapp, George Robert, 1930QE355.R6 1990 549â .03â21âdc19...Dan Behnke Demetrios Pohl Richard Graeme D. K. Jones Douglas K. Miller Arizona-Sonora Desert Museum =Donald...X-ray Crystallography, edited by N. F. M. Henry and K. Lonsdale, Kynoch Press (Birmingham, England), three...Patterns for Silicate Minerals,ââ by I. Y. Borg and D. K. Smith, Geological Society of America, Memoir 122...Crystal Data: Determinative Tables, 3d. ed., Vol. II, by Donnay et al. (American Crystallographic Association | | | Book (edition) | | Mineralogy-Dictionaries. l. Campbell, Thomas J. III. Title. II. Rapp, George Robert, 1930QE355.R6 1990 89-5633 549'...DE Demetrios Pohl DG Richard Graeme DJ D. K. Jones Douglas K. Miller DK Arizona-Sonora Desert DM Museum...X-ray Crystallography, edited by N. F. M. Henry and K. Lonsdale, Kynoch Press (Birmingham, England), three...Patterns for Silicate tvlinerals," by I. Y. Borg and D . K . Smith, Geological Society of A,nerica, Me,noir 122...Crystal Data: Detern1inative Tables, 3d. ed., Vol. II , by Donnay et al. (American Crystall ographic Association |
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