 | | Journal (article/letter/editorial) | | deposits of lakes Magadi and Matron in Kenya and Tanzania. The chert consists of finely crystalline quartz...lacustrine deposits in the vicinity of Lake Magadi, Lake Natron, and Olduvai Gorge. Although magadiite...brine with fresh water in a chemically stratified lake; localized masses may have been formed by interaction...fresher water entering the floor or margin of the lake. Magadiite and kenyaite can alter to chert in contact...less. The siliceous zeolites clinoptilolite and erionite predominate in trachyte tufts associated with |  | | Journal (article/letter/editorial) | | difference is not reflected by differences in Al/Si or Na/Ca ratios of coexisting opx or cpx. Furthermore,...the explosive activity in the Phlegrean Volcanic District (Italy) has been determined by 1H MAS-NMR spectroscopy...coefficients show that all the elements analyzed, except K, Na, Rb, Al and Si, concentrate in the Fe-rich immiscible...continuously exposed surfaces, in the Dry Valleys region, Antarctica, have about half this age. Occurrence...to be distributed as uranyl silicate precipitates (Na-boltwoodite) predominantly within interiors of sediment |  | Sand, L. B., Mumpton, F. A. - Eds. (1978) Natural Zeolites - Occurrence, Properties, Use - A selection of papers presented at Zeolite, 76, an International Conference on the Occurrence, Properties, and Utilization of Natural Zeolites, Tucson, Arizona, June 1976. Pergamon Press, Oxford. | Book | | Zeolites R. L. Hay Zeolites in Saline, Alkaline-lake Deposits R. C. Surdam and R. A. Sheppard Geological...Tsitsishvili Sorption and Diffusion in Natural Erionite D. M. Ruthven and R. I. Derrah A Survey of Catalytic... ...., Fig. 2. Analcime-rich tuffs in a saline-lake deposit near Wikieup, Arizona. This is probably...Bradley and C. S. Ross recognized zeolites in saline-lake beds of Wyoming and Arizona (Fig. 2), respectively;...million-ton size deposits of the "rare" zeolite erionite were discovered in 19 57 (Deffeyes, 1959), and |  | | Book | | counterbalanced by adding positively charged cations (Ca, K, Na, Li, Mg, Sr, Ba, Cs) to produce an electrically neutral...calcium-dominant phillipsite, K-dominant phillipsite, K-Na-dominant phillipsite, etc.). The -ian suffix means...cowlesite, dachiardite, edingtonite, epistilbite, erionite, faujasite, ferrierite, gmelinite, goosecreekite...chemical composition between Ca-rich chabazite and Na-rich herschelite and that herschelite had morphology...members could be considered disordered gismondine or Na-K-rich gismondine. HEULANDITE GROUP Heulandite and | | | Book | | counterbalanced by adding positively charged cations (Ca, K, Na, Li, Mg, Sr, Ba, Cs) to produce an electrically neutral...calcium-dominant phillipsite, K-dominant phillipsite, K-Na-dominant phillipsite, etc.). The -ian suffix means...cowlesite, dachiardite, edingtonite, epistilbite, erionite, faujasite, ferrierite, gmelinite, goosecreekite...chemical composition between Ca-rich chabazite and Na-rich herschelite and that herschelite had morphology...members could be considered disordered gismondine or Na-K-rich gismondine. HEULANDITE GROUP Heulandite and |  | | Journal (article/letter/editorial) | | Aegerine Aeschynite Akaganeite Alabandite Albite (Na end member plagioclase) Alexandrite Allanite-(Ce)...Fe7(Si8O22)(OH)2 XY2Z5(Si, Al, Ti)8O22(OH, F)2 X = K, Na, Y = Fe Ca, Mg, Mn, Zn, Z = Fe, Mn, Al, Ti NaAl(Si2O6)·(H2O)...75S Ca(Mg, Fe)(CO3)2 Ni3 (AsO4)2.8H2O CaAl2Si2O8 (Na,K)AlSi3O8 Mg7(Si8O22)(OH)2 Sb2Se3 Sb Ca5 (F,Cl,OH)...Cu2Cl(OH)3 Pd2.25Pt0.75Sn (Mg,Al)2Si4O10(OH)·4H2O (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 AuSb2 Ca(UO2)2(PO4)2·12(H2O)...Ca)3Si3O9 AuTe2 CaCO3 Na6Ca2Al6Si6O24(CO3)2 Ag8SnS6 (Ca,Na)(Sr,Ce,Ba)(CO3)2 Tl2S KMgCl3·6 (H2O) K2(UO2)2(VO4)2·3H2O | | | Journal (article/letter/editorial) | | Aegerine Aeschynite Akaganeite Alabandite Albite (Na end member plagioclase) Alexandrite Allanite-(Ce)...Fe7(Si8O22)(OH)2 XY2Z5(Si, Al, Ti)8O22(OH, F)2 X = K, Na, Y = Fe Ca, Mg, Mn, Zn, Z = Fe, Mn, Al, Ti NaAl(Si2O6)·(H2O)...75S Ca(Mg, Fe)(CO3)2 Ni3 (AsO4)2.8H2O CaAl2Si2O8 (Na,K)AlSi3O8 Mg7(Si8O22)(OH)2 Sb2Se3 Sb Ca5 (F,Cl,OH)...Cu2Cl(OH)3 Pd2.25Pt0.75Sn (Mg,Al)2Si4O10(OH)·4H2O (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 AuSb2 Ca(UO2)2(PO4)2·12(H2O)...Ca)3Si3O9 AuTe2 CaCO3 Na6Ca2Al6Si6O24(CO3)2 Ag8SnS6 (Ca,Na)(Sr,Ce,Ba)(CO3)2 Tl2S KMgCl3·6 (H2O) K2(UO2)2(VO4)2·3H2O |  | | Book (edition) | | the city limits, but also to the sur¬ rounding region. Terms for materials in GeoRef, for example, "iron...hierarchies are involved. Narrower Term (NT, NX, NA, NZ) - A specific mem¬ ber of a group which is represented...earth metals strontium e. Narrower Term (NT. NX. NA. NZ) These are Terms for specific members of the... For example: gymnosperms NA Bennettitales NA Caytoniales NA Coniferae NA Coniferales etc. In this example...Missouri NA Atchison County Missouri NA Barton County Missouri NA Benton County Missouri NA Boone County |  | | Book (volume) | | volume and quality of gemstones being mined in that region. As new localities are identified and new gemstones...localities or gemstones may lose their appeal or a region may become unproductive – so the market can be...mineral zoisite), which was discovered in 1967 in Tanzania and is now available through many retail outlets...of Afghanistan, the Sverdlovsk region of the Urals, and the Altai region of north-western China. Gems formed...sapphires (Mogok), Pakistan rubies (Hunza Mountains), Tanzania rubies (Morogoro), and Vietnam rubies (Luc Yen |
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