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Marcello Mellini
University of Siena
108Publications
26H-index
2,092Citations
Publications 108
Newest
#1Simonpietro Di Pierro (UNITO: University of Turin)
#2Chiara Groppo (UNITO: University of Turin)H-Index: 21
Last.Marcello Mellini (UNISI: University of Siena)H-Index: 26
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Source
#1Paolo Orlandi (UniPi: University of Pisa)H-Index: 18
#2Cristian Biagioni (UniPi: University of Pisa)H-Index: 13
Last.Marcello Mellini (UNISI: University of Siena)H-Index: 26
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The new mineral species lavoisierite, ideally Mn2+ 8[Al10(Mn3+Mg)][Si11P]O44(OH)12, has been discovered in piemontite-bearing micaschists belonging to the Piedmontese Nappe from Punta Gensane, Viu Valley, Western Alps, Italy. It occurs as yellow-orange acicular to prismatic-tabular crystals up to a few millimeters in length, with white streak and vitreous luster, elongated along [010] and flattened on {001}. Lavoisierite is associated with quartz, “mica,” sursassite, piemontite, spessartine, bra...
3 CitationsSource
#1Alessandro Genovese (IIT: Istituto Italiano di Tecnologia)H-Index: 29
#2Marcello Mellini (UNISI: University of Siena)H-Index: 26
Last.Stefano Merlino (UniPi: University of Pisa)H-Index: 25
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“Guarinite” crystals, of composition Na 1.56 Ca 11.13 Zr 2.33 Nb 0.07 Mn 0.51 Fe 0.40 (Si 2 O 7 ) 4 (O 3.31 F 4.69 ), show extensive defective microstructural arrangements, deriving from the presence of domains with different unit-cells. The structural complexity of “guarinite” results from the variable arrangements of simple structural building units ( i.e., Si 2 O 7 groups), possibly shifted by c /2 within the framework of octahedra. Actually, [100] and [010] images acquired with a transmissio...
Source
#1Marco PaseroH-Index: 21
#2Cristian BiagioniH-Index: 13
Last.Paolo OrlandiH-Index: 18
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#1Fernando Nieto (UGR: University of Granada)H-Index: 16
#2Marcello Mellini (UNISI: University of Siena)H-Index: 26
Last.Isabel Abad (University of Jaén)H-Index: 11
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The arguments of Vidal et al. (2010) against the incorporation of H3O+ rather than of H2O in the interlayer position of illite are disputable. Stoichiometric arguments do indeed suggest that the excess water in the Silver Hill illite is in the formof H3O+. No reason exists to assume less water content in the IMt-2 sample than in those determined by Hower and Mowatt (1966) and confirmed by the thermogravimetric analyses of Nieto et al. (2010). The comparison between element contents calculated fr...
Source
#1Fabrizio Nestola (UNIPD: University of Padua)H-Index: 20
#2Ross J. Angel (VT: Virginia Tech)H-Index: 46
Last.Marcello Mellini (UNISI: University of Siena)H-Index: 26
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The compressibility of antigorite has been determined up to 8.826(8) GPa, for the first time by single crystal X-ray diffraction in a diamond anvil cell, on a specimen from Cerro del Almirez. Fifteen pressure–volume data, up to 5.910(6) GPa, have been fit by a third-order Birch–Murnaghan equation of state, yielding V 0 = 2,914.07(23) A3, K T0 = 62.9(4) GPa, with K′ = 6.1(2). The compression of antigorite is very anisotropic with axial compressibilities in the ratio 1.11:1.00:3.22 along a, b and ...
40 CitationsSource
#1Marcello Mellini (UNISI: University of Siena)H-Index: 26
#2Gordon Cressey (AMNH: American Museum of Natural History)H-Index: 25
Last.B. A. Cressey (University of Southampton)H-Index: 11
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The crystal structure of lizardite-1 T from Gew-graze, Cornwall, has been refined by single-crystal X-ray diffractionto R 1 of 0.0263 and 0.0557, for two crystals having P 31 m space group and lattice parameters a = 5.2905(5) A, c = 7.2815(8) A, and a = 5.3111(10) A, c = 7.2907(15) A, respectively. The Gew-graze lizardite is very close to the end-member composition, so these refinements confirm the existence of well crystallized pure Mg-lizardite and show this to be the most weakly H-bonded liza...
13 CitationsSource
#1Fernando Nieto (UGR: University of Granada)H-Index: 23
#2Marcello Mellini (UNISI: University of Siena)H-Index: 26
Last.Isabel Abad (University of Jaén)H-Index: 11
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In spite of decades of research on the subject, the crystal structure of illite is still poorly understood. The purpose of this study was to address this problem by investigating the nature of the interlayer content in illite IMt-2 from Silver Hill, Montana, using analytical transmission electron microscopy (ATEM), thermogravimetry (TG), and X-ray powder diffraction (XRPD) analyses. The ATEM data, together with literature and TG results, yielded the formula K0.70a0.01(H2O)0.42 (Al1.53Fe2+0.06Fe3...
28 CitationsSource
#1Stefano Merlino (UniPi: University of Pisa)H-Index: 25
#2Marcello Mellini (UNISI: University of Siena)H-Index: 26
In their paper entitled “Marianoite, a new member of the cuspidine group from the Prairie Lake silicocarbonatite, Ontario”, [Chakhmouradian et al. (2008)][1] presented chemical, crystallographic and structural data on what they claimed is a new mineral species in the cuspidine group. All the
2 CitationsSource
#1Gian Carlo Capitani (University of Milan)H-Index: 16
#2Lars Stixrude (UCL: University College London)H-Index: 50
Last.Marcello Mellini (UNISI: University of Siena)H-Index: 26
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We have investigated the antigorite m = 17 structure [Mg48Si34O85(OH)62] by density functional theory (DFT), with the aim to probe the method on such a large and low symmetry ( Pm ) system. We found a satisfactory match with the experiments using both LDA and GGA approximations to exchange-correlation, although the former performs slightly better here. Predicted cell constants are within 0.3% for LDA, and 0.5% for GGA, of the experimental values. Average atomic displacements after relaxation are...
14 CitationsSource
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