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merlinoite

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Journal Article
Published: 01 December 2015
Mineralogical Magazine (2015) 79 (7): 1755–1767.
...G. Diego Gatta; Nicola Rotiroti; Danilo Bersani; Fabio Bellatreccia; Giancarlo Della Ventura; Silvia Rizzato Abstract A multi-methodological study of the (K,Ca)-variety of the zeolite merlinoite from Fosso Attici, Sacrofano, Italy was carried out on the basis of electron microprobe analysis...
FIGURES | View All (4)
Journal Article
Published: 01 February 2015
Mineralogical Magazine (2015) 79 (1): 191–203.
...Rosa Micaela Danisi; Thomas Armbruster; Mariko Nagashima Abstract Supposed ‘merlinoite’ crystals from Monte Somma, Vesuvius (Italy) and Fosso Attici, north of Rome (Italy) represent highly twinned coherent intergrowths between merlinoite and phillipsite on a submicroscopic level. The MER ( Immm...
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Journal Article
Published: 01 June 2014
European Journal of Mineralogy (2014) 26 (3): 371–380.
...Anna S. Pakhomova; Thomas Armbruster; Sergey V. Krivovichev; Victor N. Yakovenchuk Abstract Dehydration behaviour of the zeolite merlinoite, NaK 11 [Al 12 Si 20 O 64 ]·15H 2 O, from the Khibiny massif (Russia) was studied by means of single-crystal X-ray diffraction conjoined with step-wise heating...
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Journal Article
Published: 01 December 1990
American Mineralogist (1990) 75 (11-12): 1415–1420.
... imply that montesommaite is related to merlinoite (K 5 Ca 2 Al 9 Si 23 O 64 · 24H 2 O) and to the members of the gismondine group. This suggestion is verified by a determination of the idealized substructure of montesommaite in 14,/amd symmetry using powder diffraction intensities. Copyright © 1990...
Journal Article
Published: 01 February 1990
American Mineralogist (1990) 75 (1-2): 188–200.
...Rona J. Donahoe; Bruce S. Hemingway; J. G. Liou Abstract The heat capacities, C P , and heats of solution, Δ H soln , of six synthetic merlinoite samples having various Si/Al and Na/(Na + K) ratios were measured by low-temperature, adiabatic calorimetry and hydrofluoric acid solution calorimetry...
Journal Article
Published: 01 February 1990
American Mineralogist (1990) 75 (1-2): 201–208.
...Rona J. Donahoe; J. G. Liou; Bruce S. Hemingway Abstract The standard Gibbs free energies of formation, Δ G f,298 0 , for six synthetic merlinoite samples having various Si/Al and Na/(Na + K) ratios were calculated from previously determined entropies and enthalpies of formation: Merlinoite...
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( a ) High-temperature distortion of the <b>merlinoite</b> framework for a sample ...
Published: 01 February 2015
F ig . 8. ( a ) High-temperature distortion of the merlinoite framework for a sample from the Khibiny massif, Russia ( Pakhomova et al. , 2014 ). ( b ) Refined crystal structure of the merlinoite domain from Monte Somma at 250°C (present study). A projection along the c axis (not displayed
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Volume dependence of <b>merlinoite</b> NaK 11 [Al 12 Si 20 O 64 ]·15H 2 O ( Pakhom...
Published: 01 February 2015
F ig . 7. Volume dependence of merlinoite NaK 11 [Al 12 Si 20 O 64 ]·15H 2 O ( Pakhomova et al. , 2014 ), Monte Somma merlinoite/phillipsite (this study) and Ba-phillipsite ( Sani et al. , 2002 ) upon in situ dehydration. The Ba-phillipsite volume is doubled to be comparable with merlinoite
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Refined <b>merlinoite</b> (left) framework and corresponding view of phillipsite (...
Published: 01 February 2015
F ig . 6. Refined merlinoite (left) framework and corresponding view of phillipsite (right), viewed ( a ) down the c axis of merlinoite, ( b ) down the b axis and ( c ) down the a axis. The yellow colour highlights the tetrahedra that are oriented and connected differently in the two
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The topology of Al-Si framework in <b>merlinoite</b> (present study) as built by t...
Published: 01 June 2014
Fig. 2 The topology of Al-Si framework in merlinoite (present study) as built by three elementary units: (a) double octagonal ring, polygon symbol 4 8 8 2 , label opr, (b) ste unit (4 2 8 4 ), (c) pau unit (4 8 4 4 8 4 8 2 ). Polymerization of building units results in formation of two
Journal Article
Published: 01 June 1997
Clays and Clay Minerals (1997) 45 (3): 365–377.
..., merlinoite and sanidine grew successively in KOH solutions. In addition, a small amount of less-soluble, poorly ordered boehmite was present as products of all the experiments. Smectite mainly appeared at slightly high pH, Si/Al and Na/K conditions, whereas rhodesite should be produced in extremely high pH...
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Fosso Attici <b>merlinoite</b>&#x2F;phillipsite prepared in a glass capillary and photo...
Published: 01 February 2015
F ig . 4. Fosso Attici merlinoite/phillipsite prepared in a glass capillary and photographed under crossed polarizers.
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Powder mid-IR spectrum (upper) and single-crystal near-IR spectrum (lower) ...
Published: 01 December 2015
F ig . 4. Powder mid-IR spectrum (upper) and single-crystal near-IR spectrum (lower) of merlinoite.
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‘<b>Merlinoite</b>’ sample B from Monte Somma, Vesuvius (Museum of Natural History...
Published: 01 February 2015
F ig . 1. ‘Merlinoite’ sample B from Monte Somma, Vesuvius (Museum of Natural History Bern, NMBE 42529).
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Single-crystal Raman spectra of <b>merlinoite</b> collected with 473.1 and 632.8 n...
Published: 01 December 2015
F ig . 3. Single-crystal Raman spectra of merlinoite collected with 473.1 and 632.8 nm lasers, respectively, keeping the same crystal orientation.
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Aview of the crystal structure of <b>merlinoite</b> down [001] based on the struct...
Published: 01 December 2015
F ig . 2. Aview of the crystal structure of merlinoite down [001] based on the structure refinement of this study. The extra-framework sites are labelled according to Table 2 .
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The tetrahedral framework of <b>merlinoite</b> viewed down [100], [010] and [001]....
Published: 01 December 2015
F ig . 1. The tetrahedral framework of merlinoite viewed down [100], [010] and [001]. Interconnecting 8-membered ring channels run parallel to [100], [010] and [001].
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Variations of unit-cell parameters of <b>merlinoite</b> with heating: (a) unit-cel...
Published: 01 June 2014
Fig. 3 Variations of unit-cell parameters of merlinoite with heating: (a) unit-cell volume vs . temperature. The variation of H 2 O content is displayed; (b) cell dimensions vs . temperature. The size of the symbols is significantly larger than associated standard deviations ( Tables 1 and S1).
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Crystal structures of <b>merlinoite</b> (a,b) and its dehydrated phases at 75 °C (...
Published: 01 June 2014
Fig. 4 Crystal structures of merlinoite (a,b) and its dehydrated phases at 75 °C (c,d), 125 °C (e,f), 225 °C (g,h). K atoms and H 2 O molecules are shown as yellow and blue spheres, respectively. Size of spheres correlates to site occupancy. Labels of extraframework sites are given
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Crystal structure of synthetic <b>merlinoite</b> K 11.5 [Al 11.5 Si 20.5 O 64 ]·15...
Published: 01 June 2014
Fig. 5 Crystal structure of synthetic merlinoite K 11.5 [Al 11.5 Si 20.5 O 64 ]·15H 2 O (a, b) and its fully dehydrated phase (c,d) ( Skofteland et al. , 2001 ). The room-temperature phase has space group Immm whereas the dehydrated phase possesses space group Pnnm with different axial