Stefanο Merlino

Accademia Nazionale dei Lincei

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OD structures

Oxford University Press eBooks (2008)

Giovanni Ferraris Emil Makovicky Stefanο Merlino

This chapter starts with some motivations leading to the concept of Ordered Derivative (OD) structures and corresponding theory to deal with one-dimensional disorder of two-dimensionally ordered layers. It introduces the terminology and procedures through the use of wollastonite structure which played a prominent role in inspiring the foundation of OD theory by Dornberger-Schiff. Basic terms and definition are given for OD structures of equivalent layers and also for those of M kinds of layers: partial operations of λ- and σ-type, OD families, categories of OD structures, NFZ formula, and MDO structures. The diffraction features of OD structures (family reflections and characteristic reflections) are presented and discussed. Numerous examples of OD families both of equivalent layers and with two or more kinds of distinct layers are illustrated, with indication of the heuristic power of the OD approach. The chapter contains also a table of monoclinic and orthorhombic OD groupoid families.

Monoclinic crystal system

Orthorhombic crystal system

10.1093/acprof:oso/9780199545698.003.0002

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Pitiglianoite, a new feldspathoid from southern Tuscany, Italy: Chemical composition and crystal structure

American Mineralogist (1991)

Stefanο Merlino Marcellο Mellini Elena Bonaccorsi Marco Pasero Leonardo Leoni

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Citations (23)

Pb2Fe3+Cl3(OH)4-H20, a newly discovered natural phase from Tuscany, Italy: physico-chemical data, crystal structure, and OD character

European Journal of Mineralogy (1996)

Marco Pasero Natale Perchiazzi Simona Bigi Marco Franzin Stefanο Merlino

10.1127/ejm/9/1/0043

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Natural and synthetic tobermorites: structural data and thermal behaviour

Elena Bonaccorsi Stefanο Merlino

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Polytypes and polytype categories

Oxford University Press eBooks (2008)

Giovanni Ferraris Emil Makovicky Stefanο Merlino

10.1093/acprof:oso/9780199545698.003.0003

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Crystal structure of 2Mand 1Apolytypes of balangeroite

Zeitschrift für Kristallographie - Crystalline Materials (2012)

Elena Bonaccorsi Giovanni Ferraris Stefanο Merlino

Balangeroite, with ideal crystal chemical formula (Mg,Fe)42O6(Si4O12)4(OH)40, displays two MDO polytypes, balangeroite-2M (a = 19.179, b = 9.601, c = 19.218 Å, β = 90.52°; space group P2/n) and balangeroite-1A (a = 9.602, b = 13.891, c = 14.012 Å, α = 86.99°, β = 76.79°, γ = 76.67°; space group P-1). Both polytypes are built up by octahedral walls 3 × 1, octahedral bundles 2 × 2 and four-repeat silicate chains. All these modules run parallel to the 9.6 Å axis (b and a in the monoclinic and triclinic polytype, respectively). The distinguishing features between the two polytypes are in the different positioning of the silicate chains, which gives rise to distinct cells and space groups.

Triclinic crystal system

Monoclinic crystal system

Crystal (programming language)

Space group

Tetrahedron

10.1524/zkri.2012.1498

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Citations (4)

OD character in PbFeCl, a new lead and iron (III) hydroxychloride with a novel structure-type

Marco Pasero Natale Perchiazzi Simona Bigi Marco Franzini Stefanο Merlino

Lead (geology)

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X-ray crystallography of krinovite

Zeitschrift für Kristallographie (1972)

Stefanο Merlino

The unit cell of the meteoritic mineral krinovite, NaMg2CrSi3O10, is triclinic with a = 10.22, b = 10.67, c = 8.80 Å, α = 105° 8′, β = 96° 36′, γ = 125° 1′. The monoclinic unit cell given by Olsen and Fuchs is one of the possible pseudomonoclinic cells. Krinovite is polysynthetically twinned with the b axis of the pseudomonoclinic cell as twin axis. The close relationships among krinovite, aenigmatite and rhönite are shown. The crystal structure of krinovite is suggested and the crystallochemical formula NaVIII2MgVI4CrVI(CrVI)O2Si6O18 is derived.

10.1524/zkri.1972.136.1-2.81

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Citations (18)

Lavinskyite-1M, K(LiCu)Cu6(Si4O11)2(OH)4, the monoclinic MDO equivalent of lavinskyite-2O (formerly lavinskyite), from the Cerchiara manganese mine, Liguria, Italy

European Journal of Mineralogy (2018)

Uwe Kolitsch Stefanο Merlino Donato Belmonte Cristina Carbone Roberto Cabella

Monoclinic crystal system

10.1127/ejm/2018/0030-2731

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Citations (10)

Polytypism in stibivanite

The Canadian Mineralogist (1989)

Stefanο Merlino Paolo Orlandi Natale Perchiazzi Riccardo Basso Andrea Palenzona

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Citations (10)