 | | Journal (article/letter/editorial) | | 2001 Thermochemical study of calcium zeolites—heulandite and stilbite I. KISELEVA,1 A. NAVROTSKY,*,2 I...State University, Vorobyevy Gory, Moscow 119899, Russia 2 Thermochemistry Facility, Department of Chemical...630090, Russia ABSTRACT Calorimetric measurements were made on natural samples of heulandite having the...27H2O both from the same locality (Nidym River, E. Siberia, Russia). Enthalpies of formation and hydration...formation from oxides and elements at 298 K of heulandite are: -238.7 ± 4.9 kJ/mol, and –10656.3 ± 8.6 |  | | Journal (issue) | | Washington Interstate Bridge Oregon Columbia River 2 Barahonaite, a New Mineral from Gold Hill, Utah...varying a bit in composition: Barahonaite-(Fe) (Ca,Cu,Na,Fe3+,Al)12Fe3+2(AsO4)8(OH)x·nH2O is yellow...composite crystals, up to 20 µm long. Barahonaite-(Al) (Ca,Cu,Al,Na)12Al2(AsO4)8(OH)x·nH2O is pale blue in...minerals involved are as follows: Diopside Ca Mg Si2 O6 Augite (Ca,Na) (Mg,Fe,Al,Ti) (Si,Al)2 O6 Judging from...composed of four end members: Diopside Ca Mg Si2 O6 Hedenbergite Ca Fe Si2 O6 Clinoenstatite Mg2 Si2 O6 |  | | Book | | content in framework aluminosilicates is always (Ca + Mg+ Ba + NaZ+ KZ)/AI = 1. Zeolites differ from...molecules. The general formula for a zeolite mineral is (Ca,NaZ,KZ,Ba,Sr,Mg,CsZ,LiZ)a[AlaSi n_a 0Zn] •xHZO The...counterbalanced by adding positively charged cations (Ca, K, Na, Li, Mg, Sr, Ba, Cs) to produce an electrically...zeolites such as analcime, chabazite, stilbite, and heulandite can be easily identified, named, and cataloged...ratio can be written, for example, as silica-rich heulandite rather than clinoptilolite. Descriptive modifiers | | | Book | | content in framework aluminosilicates is always (Ca + Mg+ Ba + NaZ+ KZ)/AI = 1. Zeolites differ from...molecules. The general formula for a zeolite mineral is (Ca,NaZ,KZ,Ba,Sr,Mg,CsZ,LiZ)a[AlaSi n_a 0Zn] •xHZO The...counterbalanced by adding positively charged cations (Ca, K, Na, Li, Mg, Sr, Ba, Cs) to produce an electrically...zeolites such as analcime, chabazite, stilbite, and heulandite can be easily identified, named, and cataloged...ratio can be written, for example, as silica-rich heulandite rather than clinoptilolite. Descriptive modifiers |  | 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 | | substantial portion of Eocene tuff beds in the Uintah Basin of Colorado, Wyoming, and Utah. In 1928 W. H. Bradley...and in 1936 Fenner described extensive zones of heulandite in Yellowstone drill cores. The deep-sea zeolites...analcime, chabazite, clinoptilolite, erionite, heulandite, laumontite, mordenite, phillipsite, and wairakite...ranking "number one" in abundance. Except for heulandite, laumontite, and wairakite, "sedimentary" zeolites...lateral zonation: fresh ash near the margins of the basin, followed by a zone of almost complete zeolitization |
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Nidym River, Nizhnyaya Tunguska River Basin, Evenkiysky District, Krasnoyarsk Krai, Russia