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merlinoite

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Journal Article

A multi-methodological study of the (K,Ca)-variety of the zeolite merlinoite

G. Diego Gatta, Nicola Rotiroti, Danilo Bersani, Fabio Bellatreccia, Giancarlo Della Ventura, Silvia Rizzato
Published: 01 December 2015
Mineralogical Magazine (2015) 79 (7): 1755–1767.
DOI: https://doi.org/10.1180/minmag.2015.079.7.03
...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...
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Journal Article

Structural intergrowth of merlinoite/phillipsite and its temperature-dependent dehydration behaviour: a single-crystal X-ray study

Rosa Micaela Danisi, Thomas Armbruster, Mariko Nagashima
Published: 01 February 2015
Mineralogical Magazine (2015) 79 (1): 191–203.
DOI: https://doi.org/10.1180/minmag.2015.079.1.15
...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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Dehydration of the zeolite merlinoite from the Khibiny massif, Russia: an in situ temperature-dependent single-crystal X-ray study

Anna S. Pakhomova, Thomas Armbruster, Sergey V. Krivovichev, Victor N. Yakovenchuk
Published: 01 June 2014
European Journal of Mineralogy (2014) 26 (3): 371–380.
DOI: https://doi.org/10.1127/0935-1221/2014/0026-2380
...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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Includes: Supplemental Content
Journal Article

Montesommaite, (K,Na) 9 Al 9 Si 23 O 64 .10H 2 O, a new zeolite related to merlinoite and the gismondine group

Roland C. Rouse, Pete J. Dunn, Joel D. Grice, John L. Schlenker, John B. Higgins
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...
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Journal Article

Thermochemical data for merlinoite; 1, Low-temperature heat capacities, entropies, and enthalpies of formation at 298.15 K of six synthetic samples having various Si/Al and Na/(Na + K) ratios

Rona J. Donahoe, Bruce S. Hemingway, J. G. Liou
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...
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Thermochemical data for merlinoite; 2, Free energies of formation at 298.15 K of six synthetic samples having various Si/Al and Na/(Na + K) ratios and application to saline, alkaline lakes

Rona J. Donahoe, J. G. Liou, Bruce S. Hemingway
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 <span class="search-highlight">merlinoite</span> framework for a sample ...

( a ) High-temperature distortion of the merlinoite 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 <span class="search-highlight">merlinoite</span> NaK 11 [Al 12 Si 20 O 64 ]·15H 2 O ( Pakhom...

Volume dependence of merlinoite 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 <span class="search-highlight">merlinoite</span> (left) framework and corresponding view of phillipsite (...

Refined merlinoite (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 <span class="search-highlight">merlinoite</span> (present study) as built by t...

The topology of Al-Si framework in merlinoite (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

Experimental study on the formation of zeolites from obsidian by interaction with NaOH and KOH solutions at 150 and 200 degrees C

Motoharu Kawano, Katsutoshi Tomita
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 <span class="search-highlight">merlinoite</span>&#x2F;phillipsite prepared in a glass capillary and photo...

Fosso Attici merlinoite/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) ...

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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‘<span class="search-highlight">Merlinoite</span>’ sample B from Monte Somma, Vesuvius (Museum of Natural History...

‘Merlinoite’ 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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The tetrahedral framework of <span class="search-highlight">merlinoite</span> viewed down [100], [010] and [001]....

The tetrahedral framework of merlinoite 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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Single-crystal Raman spectra of <span class="search-highlight">merlinoite</span> collected with 473.1 and 632.8 n...

Single-crystal Raman spectra of merlinoite 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 <span class="search-highlight">merlinoite</span> down [001] based on the struct...

Aview of the crystal structure of merlinoite 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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Variations of unit-cell parameters of <span class="search-highlight">merlinoite</span> with heating: (a) unit-cel...

Variations of unit-cell parameters of merlinoite 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 <span class="search-highlight">merlinoite</span> (a,b) and its dehydrated phases at 75 °C (...

Crystal structures of merlinoite (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 <span class="search-highlight">merlinoite</span> K 11.5 [Al 11.5 Si 20.5 O 64 ]·15...

Crystal structure of synthetic merlinoite 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