 | | Journal (article/letter/editorial) | | AMERICAN MAKATITE, MINERA],OGIST, VOL.'55, MARCH_APRIL, 1970 A NEW HYDROUS SODIUM SILICATE MINERAL...MINERAL FROM LAKE MAGADI, KENYA1 Rrcneno A. SunppanD AND Anrrrun J. Guon, III, U. S. Geologicol Suraey,Federal...California, Berkeley, Colifornia 94720 A-Bsrnect Makatite was found in cores of trona from three drill holes...holes in the Evaporite Series of Lake Magadi, Kenya. The makatite occurs as white spherulites or radiating...partly filI cavities in coarsely crystalline trona. Makatite commonly makes up 5-20 percent of the core and |  | | Report (issue) | | Makatite Na2 Si4 O8(OH)2 ² 4H2 O ° c 2001 Mineral Data Publishing, ver sion 1.2 Crystal Data: Monoclinic...094(3) c = 9.5234(5) X-ray Powder Pattern: Lake Magadi, Kenya. 5.09 (100), 2.998 (57), 9.04 (53), 2.883... 15.79 25.00 22.96 99.75 100.00 (1) Lake Magadi, Kenya. (2) Lovozero massif, Russia. (3) Na 2 Si...drill holes in a lacustrine evaporite series (Lake Magadi, Kenya); leached from natrosilite in an alkalic...anorthoclase, gaylussite, organic material (Lake Magadi, Kenya); natrolite (Lovozero massif, Russia); vuonnemite |  | | Journal (article/letter/editorial) | | S A S S O C I A T E D W I T H T H E S A L I N E LAKE DEPOSITS OF EAST AFRICA * James R. O'NEIL U.S. Geological...44.1. The 6180 values correlate in general with lake salinities as inferred from geologic evidence, indicating...chert was formed from its precursor in contact with lake water trapped at the time of deposition. A few of...silicate, makatite (NaSi2 O3(OH)a'H2 O) has been discovered in cores of trona from Lake Magadi [6]. The...("natro-carbonatite") lava for comparison with trona of Lake Magadi. The number of analyses is reasonably adequate |  | | Journal (article/letter/editorial) | | 1967)and makatite (Sheppard et al. 1970)at Lake Magadi, Kenya, and kanemite at Kanem, Lake Chad (Johan...as NaHSi2O5. 3H2O (kanemite), Na2SiaOe . 5H2O (makatite), Na2SilaO2e .9H2O (magadiite) and . l0H2O (kenyaite)...moles H2O (Lagaly et al., 1973). Kanemite and makatite can also be easily prepared (Beneke and Lagaly...from the Magadi area (alluvial channel, Lake Magadi) provided by the Magadi Soda Comp., Kenya, was studiedfor...H2OA.{aOHratios are low (stippled area in Fig. l) makatite and "octosilicate" are formed. "Octosilicate" |  | | Report (issue) | | 61.9608(46) Z = [2] X-ray Powder Pattern: Lake Magadi, Kenya. 15.41 (100), 3.44 (80), 3.146 (50), 3.30...(3) 78.96 5.82 15.22 100.00 (1) Lake Magadi, Kenya. (2) Alkali Lake Playa, Oregon, USA. (3) Na2Si14O28(OH)2∙8H2O...precipitated by evaporation of saline brines (Lake Magadi); in veins cutting playa sediments and in muds...associated with alkali salts and brines (Alkali Lake Playa, Oregon); in altered volcanic rocks (Trinity...Canada). Association: Kenyaite, calcite (Lake Magadi); kanemite (Lake Chad); bavenite, pectolite, apophyllite |  | | Journal (article/letter/editorial) | | by Eugster (1967) in Lake Magadi, Kenya, but it has since been found in Alkali Lake, Oregon (Rooney et...et al. 1969), and Trinity County, California (McAtee et al. 1968). Although the structure of magadiite...(USGS-Denver) from a locality near Trinity River, Trinity County, California, as 2-5 cm3 aggregates. Transmission...similar to that of a related Na-silicate called makatite (Na2Si40s(OH)2·4H20) (Annehed et al. 1982), then...(Eugster 1967), silhydrite (Gude and Sheppard 1972), makatite (Sheppard and Gude 1970) and many others known |  | | Journal (article/letter/editorial) | | disequilibria in early diagenetic minerals from Lake Magadi sediments, Kenya: Dating potential and CLAUDE HILLAIRE-MARCEL...the southern end of the Gregory Rift Valley, Lake Magadi occupies the bottom of a relatively large drainage...silty-clay units deposited during Late Pleistocene high lake stands. These units consist of a mixture of detrital...14Cchronology already established for the most recent high lake level episode in the basin ( lO,~-12,~ yr BP). ~urn-~~~tes...lacustrine unit was deposited during a former high Lake Magadi level, possibly during the lacustrine episode |  | | Journal (article/letter/editorial) | | hydrous sodium silicates from the northern bank of Lake Chad: occurrence, petrology and genesis D. Sebag...the Holocene in N'Guigmi interdunal depressions (Lake Chad), which led to the precipitation of various...evolution, of which the ®nal stage is probably Magadi-type chert. The study of various deposits of these...Keywords: Arid environment; Diagenesis; Holocene; Lake Chad; Silicate minerals; Sodium 1. Introduction...kenyaite; Kan, kanemite; Mag, magadiite; Mak, makatite; Sil, silhydrite. their formation and transformation |  | | Journal (article/letter/editorial) | | ) SILHYDRITE, 3SiO2.H2O,A NEW MINERAL TRINITY COUNTY, CALIFORNIA1 FROM AnrHun J. Gulo, 31, ewo Rrcuenl...80225 ABSTRACT silhydrite occurs at the Trinity county magadiite deposit where near-surface water leached...detailed mineralogical study at the Trinity County magadi- ite deposit.It is difficult to recognizein...Field evidence and laboratory work on the Trinity County material indicate that leaching by near-surface... 6 W., in the Bonanza King quadrangle, Trinity County, Calif. Two earlier papers (McAtee et al.,lg68; |  | Pekov, I. V., Chukanov, N. V., Zadov, A. E., Zubkova, N. V., Pushcharovsky, D. Yu. (2007) Chesnokovite, Na2[SiO2(OH)2] · 8H2O, the first natural sodium orthosilicate from the Lovozero alkaline pluton, Kola Peninsula: Description and crystal structure of a new mineral species. Geology of Ore Deposits, 49 (8) 727-738 doi:10.1134/s1075701507080077 | Journal (article/letter/editorial) | | NaSi7O13(OH)3 · 4H2O, kenyaite Na2Si22O41(OH)8 · 6H2O, makatite Na2Si4O8(OH)2 · 4H2O, kanemite NaHSi2O4(OH)2 ·...soda-bearing sediments of Lake Magadi, Kenya (Eugster, 1967). A few years later, makatite and kanemite also found...were described from a quite different setting. Makatite and new minerals—revdite and grumantite—were found...peralkaline massifs and are most abundant in Lovozero. Makatite, kanemite, revdite, and grumantite, which occur...wt % against a theoretical 57 wt %), whereas in makatite, revdite, kanemite, grumantite, magadiite, and |  | | Journal (article/letter/editorial) | | 1329 Arizona Economic geology Aluminum, Maricopa county, Wickenberg (Sheridan, Michael F , et al.) tt-t2...(Mclean, W. John, er a/.) 7-E 1103 Hemihedrite,Pinal county, Florencemine, Maricopacounty, Wickenburg,Rat Tail...a/.) 7-8 1088 Kinoite, SantaRita mountains,Pima county (Anthony, John W., er a/.) 5-6 7O9 Phoenicochroite...er a/.) 1.2 224 Breccia Intrusive Utah, San Juan county, MosesRock dike, kimberlite (McGetchin, Thomas...(Omori, Keiichi.) tt-12 1897 Wardsmithite,Inyo county, Death Valley, Tertiary, Furnace Creek formation |  | | Journal (article/letter/editorial) | | (1969) Inorganic Bedded Cherts from the Magadi Area, Kenya HANS P. EUGSTV~ Earth and Planetary Sciences...Maryland Received February 6, 1969 Abstract. The High Magadi beds can be divided into a lower and an upper sequence...taken place in annual increments in a stratified lake at the brine-epilimnion interface. The maximum duration...years. Solubility measurements indicate that most Magadi waters at the present time are supersaturated with...mechanism for the formation of bedded chert observed at Magadi is suggested to apply also to the Dales Gorge Member |  | | Journal (article/letter/editorial) | | family of layered Na silicates which also includes makatite (Sheppard & Gude, 1970), kanemite (Johan & Maglione...found it, together with kenyaite, in lake beds at Lake Magadi (Kenya). The mineral magadiite can be synthesized...H.B. (1967) Hydrous sodium silicate from lake Magadi, Kenya: precursors for bedded chert. , , 1177ÿ1180...Gude A.J. (1970) Makatite, a new hydrous sodium silicate mineral from Lake Magadi, Kenya. , , 358. Sing |  | | Journal (article/letter/editorial) | | silicates such as kanemite, magadiite, kenyaite, or makatite, have been used as precursors for the design of...Na[Si7O13(OH)3]·4H2O Na2Si22O41(OH)8·6H2O Na2Si4O9 Makatite Silinaite Natrosilite Grumantite Magadiite* Kenyaite...NaSi7O13(OH)3·4H2O, kenyaite, Na2Si22O41(OH)8·6H2O, makatite, Na2Si4O8(OH)2·4H2O, kanemite, NaHSi2O4(OH)2·2H2O...discovered in the soda-bearing sediments of Lake Magadi, Kenya (Eugster, 1967). Except kenyaite, all the...(Garvie et al., 1999; Vortmann et al., 1999), makatite (Annehed et al., 1982), silinaite (Grice, 1991) |  | | Journal (article/letter/editorial) | | reactions in the sedimentary deposits of the Lake Magadi region, Kenya RONALD C. SURD AM Department of Geology...M a g a d i basin in the Eastern Rift Valley of Kenya have been investigated. Samples were available f...This gel f o r m s at the lake shore a n d is w a s h e d i n t o the lake d u r i n g flooding conditions...glasses, a n d the brines they come in contact with. Lake M a g a d i represents a u n i q u e o p p o r t...zeolite that will f o r m in a specific alkaline lake e n v i r o n m e n t c a n n o t yet be predicted |  | | Report (chapter) | | the Lake Bogoria basin, Kenya Rift Valley R.W. Renaut, J.J. Tiercelin & R.B. Owen SUMMARY: Lake Bogoria...Bogoria is a perennial, saline, alkaline closed lake fed by hot springs and ephemeral runoff. Detailed studies...both from exposures around the shoreline and from lake bottom cores, have provided abundant evidence for...vivianite. Modern and ancient saline, alkaline lake deposits are well known for their abundant and varied...in the rift valley lake basins of East Africa. Of the East African lakes, Magadi is often regarded as |  | | Journal (article/letter/editorial) | | member of a family of silicic acids comprising also makatite [the only member whose structure is known (Annehed...Lincoln, F.I. (1982) Crystal structure of synthetic makatite Na2Si 40s(OH)2-4H 20. ZeitschriJt Jilr Kristallographie...H.P. (1967) Hydrous sodium silicates from lake Magadi, Kenya: Precursors of bedded chert. Science, 157...NMRstudies on a synthetic sodium silicate hydrate (makatite) and its crystalline silicic acid. Zeitschrift |  | | Journal (article/letter/editorial) | | family of layered Na silicates which includes makatite, kanemite, kenyaite, and octosilicate. It was...found it, together with kenyaite, in lake beds at Lake Magadi, Kenya. Recent studies of magadiite have focused...H.B. (1967) Hydrous sodium silicate from lake Magadi, Kenya: precursors for bedded chert. Science, 157...and Eugster, H.P. (1968) Magadiite from Trinity County, California. American Mineralogist, 53, 2061 2069 |  | | Journal (article/letter/editorial) | | silicate minerals which also includes kanemite, makatite, kenyaite, and octosilicate (Almond et al., 1997;...discovered it, together with kenyaite, in lake beds in Lake Magadi in Kenya. Magadiite has a layered structure...H.P. (1967) Hydrous sodium silicates from Lake Magadi, Kenya: Precursors of bedded chert. Science, 157 |  | | Journal (issue) | | Cooper Nottingham, England Anthony R. Kampf L.A. County Mus. of Nat. Hist. Los Angeles, CA Joseph A. Mandarino...miniature size) from the Eagle’s Nest mine in Placer County, California (half of them with quartz matrix) were...Richard Rice, a lifetime resident of Washington County, Oregon, was a retired logging contractor. With...towns of Varennes and Saint-Amable in Vercheres County, Quebec, approximately 20 km east-northeast of...Labuntsovite L&venite Lemoynite Lorenzenite Magadiite Makatite M angan-neptunite Microcline M ontmorillonite |  | | Journal (article/letter/editorial) | | Brookins, D. G. Metastibnite from The Geysers, Sonoma county, California Brown, F. H. Zoning in some volcanic...beta-Be(OH)1, from the Rode Ranch pegmatite' Llano county, Texas Einaudi. Marco T. An iron-sensitive stain...Arthur J., rrl Makatite, a new hydrous sodium silicate mineral from Laxe Magadi, Kenya Gude, Arthur J...related rocks in the Moses Rock dike, San Juan county, Utah McGuire, Robert C. lmplications of hydroxyl-oxygen...beta-Be(OH):, from the Rode Ranch pegmatite, Llano county, Texas Moiola, Richard J. Authigenic zeolites and |  | | Journal (article/letter/editorial) | | CHAD (1) Localities (1) Kanemite: Kanem region, Lake Chad. CONGO(3) People (2) Fornacite: Lucien Louis...and Guinea proved invaluable to Alfred Lacroix. KENYA (6) People (3) Berdesinskiite: Waldemar Berdesinski...Localities (2) Kenyaite: Kenya. Magadiite: Lake Magadi. Others (1) Makatite: From the Masai word emakat |  | | Journal (article/letter/editorial) | | localities Abbreviations: (Dst.) district, area; (Co.) county; (m.) mine; (Mf.) massif; (Q.) quarry; (N) north...х 20–25 km), NE of Houghton (47°06`N, 88°32`W), Lake Superior, Michigan, USA \\1925pumpellyite (Mg);...…1967madocite 4 – Magadi (Lake Magadi) \W of Magadi (1°53`S, 36°18`E), Kenya \\1909uhligite; …1970makatite 8 – Mammoth...Africa \\1968nimite;…1974bonaccordite 11 – Searles Lake \ (15 х 12 km), near Trona (35°45`N, 117°22`W),...Tanco pegmatite m. \ (50°26`N, 95°27`W), Bernic Lake, Manitoba, Canada \\1978cernyite;…1992titanowodginite |  | | Journal (article/letter/editorial) | | round gadolinitein the Rode Ranch pegmatite, Llano County, Texas. Named from the composition. Bernalite....from the Mammoth-St. Anthony mine, Tiger, Pinal County, Arizona. Named for its discoverer, Richard A....rock in the Cane Creek potash mine, Moab, Grand County, Utah; 956 M.H. HEY formula given as (Ca,Naz)7Ln2BzzO43...Mineral QM, from Madoc, Ontario, and from Pershing County, Nevada, are identical; monoclinic, composition...Florence mine, Pinal County, Arizona, and the Pack Rat claim, Wickenburg, Maricopa County, Arizona, are near |  | | Report (issue) | | Geological Survey, 1950) Trinity Anemousite County, California. Contributions to Mineral¬ (discredited...1920) NMNH 106112 from the Hillside Mine, Yavapai County, Ari¬ L. G. Berry, 1947. Composition and Optics...Aluminocopiapite Utah NMNH K. J. Murata, Trinity County, California M. C. Bandy, 1938. Utah. J. M. Axelrod...Island Mountain, Mountain, from Mine, Yavapai County, Arizona (L. J. Cabri, 1976) Island Group (F...Mine, near Yucca Station, A&P Railroad, Mohave County, Ai'izona A Basic Copper Sulphate. United States |
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