1,721,090 research outputs found
Minerals and materials: building principles and applications - A special issue in honour of Giovanni Ferraris and Stefano Merlino. Preface
No full textCruciani G., Orlandi P., Pasero M. and Russo M.: First italian occurrence of cumengeite from Vesuvius: crystal-structure refinement and revision of the chemical formula
No full textThe New IMA List of Minerals – A Work in Progress – Update: February 2013
No full textIn the following pages of this document a comprehensive list of all valid mineral species is presented. The list is distributed (for terms and conditions see below) via the web site of the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association, which is the organization in charge for approval of new minerals, and more in general for all issues related to the status of mineral species. The list, which will be updated on a regular basis, is intended as the primary and official source on minerals
The New IMA List of Minerals – A Work in Progress – Updated: November 2017
No full textIn the following pages of this document a comprehensive list of all valid mineral species is presented. The list is distributed (for terms and conditions see
below) via the web site of the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association, which is the
organization in charge for approval of new minerals, and more in general for all issues related to the status of mineral species. The list, which will be
updated on a regular basis, is intended as the primary and official source on minerals.
Explanation of column headings:
Name: it is the presently accepted mineral name (and in the table, minerals are sorted by name).
CNMMN/CNMNC approved formula: it is the chemical formula of the mineral.
IMA status: A = approved (it applies to minerals approved after the establishment of the IMA in 1958); G = grandfathered (it applies to minerals
discovered before the birth of IMA, and generally considered as valid species); Rd = redefined (it applies to existing minerals which were redefined
during the IMA era); Rn = renamed (it applies to existing minerals which were renamed during the IMA era); Q = questionable (it applies to poorly
characterized minerals, whose validity could be doubtful).
IMA No. / Year: for approved minerals the IMA No. is given: it has the form XXXX-YYY, where XXXX is the year and YYY a sequential number; for
grandfathered minerals the year of the original description is given. In some cases, typically for Rd and Rn minerals, the year may be followed by s.p.
(special procedure): it refers to the year in which a specific action (redefinition and/or renaming) took place, and was approved by IMA. This may be
related to the approval of a report by a dedicated subcommittee on a given group of minerals.
Country: it is the country in which the mineral was discovered for the first time (according to the national boundaries as of today).
First reference: it is the original reference for each mineral.
Second reference: it is the most recent or most complete reference for each mineral, possibly including a crystal structure study
The New IMA List of Minerals – A Work in Progress – Updated: November 2018
No full textIn the following pages of this document a comprehensive list of all valid mineral species is presented. The list is distributed (for terms and conditions see
below) via the web site of the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association, which is the
organization in charge for approval of new minerals, and more in general for all issues related to the status of mineral species. The list, which will be
updated on a regular basis, is intended as the primary and official source on minerals.
Explanation of column headings:
Name: it is the presently accepted mineral name (and in the table, minerals are sorted by name).
CNMMN/CNMNC approved formula: it is the chemical formula of the mineral.
IMA status: A = approved (it applies to minerals approved after the establishment of the IMA in 1958); G = grandfathered (it applies to minerals
discovered before the birth of IMA, and generally considered as valid species); Rd = redefined (it applies to existing minerals which were redefined
during the IMA era); Rn = renamed (it applies to existing minerals which were renamed during the IMA era); Q = questionable (it applies to poorly
characterized minerals, whose validity could be doubtful).
IMA No. / Year: for approved minerals the IMA No. is given: it has the form XXXX-YYY, where XXXX is the year and YYY a sequential number; for
grandfathered minerals the year of the original description is given. In some cases, typically for Rd and Rn minerals, the year may be followed by s.p.
(special procedure): it refers to the year in which a specific action (redefinition and/or renaming) took place, and was approved by IMA. This may be
related to the approval of a report by a dedicated subcommittee on a given group of minerals.
Country: it is the country in which the mineral was discovered for the first time (according to the national boundaries as of today).
First reference: it is the original reference for each mineral.
Second reference: it is the most recent or most complete reference for each mineral, possibly including a crystal structure study
The New IMA List of Minerals – A Work in Progress – Updated: July 2017
No full textIn the following pages of this document a comprehensive list of all valid mineral species is presented. The list is distributed (for terms and conditions see
below) via the web site of the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association, which is the
organization in charge for approval of new minerals, and more in general for all issues related to the status of mineral species. The list, which will be
updated on a regular basis, is intended as the primary and official source on minerals.
Explanation of column headings:
Name: it is the presently accepted mineral name (and in the table, minerals are sorted by name).
CNMMN/CNMNC approved formula: it is the chemical formula of the mineral.
IMA status: A = approved (it applies to minerals approved after the establishment of the IMA in 1958); G = grandfathered (it applies to minerals discovered
before the birth of IMA, and generally considered as valid species); Rd = redefined (it applies to existing minerals which were redefined during the IMA era);
Rn = renamed (it applies to existing minerals which were renamed during the IMA era); Q = questionable (it applies to poorly characterized minerals, whose
validity could be doubtful).
IMA No. / Year: for approved minerals the IMA No. is given: it has the form XXXX-YYY, where XXXX is the year and YYY a sequential number; for
grandfathered minerals the year of the original description is given. In some cases, typically for Rd and Rn minerals, the year may be followed by s.p.
(special procedure): it refers to the year in which a specific action (redefinition and/or renaming) took place, and was approved by IMA. This may be related
to the approval of a report by a dedicated subcommittee on a given group of minerals.
Country: it is the country in which the mineral was discovered for the first time (according to the national boundaries as of today).
First reference: it is the original reference for each mineral.
Second reference: it is the most recent or most complete reference for each mineral, possibly including a crystal structure study
Current trends in mineralogical systematics and the management of the IMA List of Minerals
No full textThe New IMA List of Minerals – A Work in Progress – Updated: November 2021
No full textthe list includes selected information on the 5762 currently valid specie
The New IMA List of Minerals – A Work in Progress – Updated: January 2021
No full textthe list includes selected information on the 5673 currently valid specie
Superstructure of moraesite: a synchrotron study
No full textMoraesite (Lindberg et al., 1953) is a hydrated berillophosphate with ideal chemical formula Be2(PO4)(OH)·4H2O. Its structure has been known since 1992 (Merlino & Pasero, 1992) and refined in the space group C2/c, a = 8.553(6) Å, b = 12.319(6) Å, c = 7.155(8) Å, β = 97.93(9)°. The main structural feature of moraesite is the presence of large structural cavities occupied by water molecules. The latter are implicated in a complex system of hydrogen bonds where two possible hydrogen bond schemes are equally possible. Few very weak superstructure reflections were observed (Merlino & Pasero, 1992), indicating that the true unit cell of moraesite was probably three times larger, with a b parameter of 36.96 Å and space group symmetry Cc. It was suggested by the authors that the ordering of the hydrogen bond system, concerted with minor adjustments of the structure, could be responsible for the triplication of the b axis. X-ray diffraction data, more recently obtained through synchrotron radiation, confirmed the occurrence of superstructure reflections which were indexed on the basis of an unit cell with tripled b axis. The superstructure of moraesite (a = 8.572(3) Å, b = 36.971(8) Å = 3 x bsub, c = 7.153(2) Å, β = 97.72(1)°, space group Cc) was refined up to R = 0.081 for 1789 unique reflections with Fo > 4sigma(Fo) and 0.0906 for all 2088 data. The structural refinement confirmed that the triplication of the parameter b is due to the ordering of the two possible hydrogen bonding schemes.
1) Lindberg M.L., Pecora W.T. & Barbosa A.L.M. (1953) - Moraesite, a new hydrous beryllium phosphate from Minas Gerais, Brazil. American Mineralogist, 38, 1126-1133.
2) Merlino S. & Pasero M. (1992) - Crystal chemistry of beryllophosphates: The crystal structure of moraesite, Be2(PO4)(OH)·4H2O, Zeitschrift für Kristallographie, 201, 253-262
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