Articles | Volume 36, issue 4
https://doi.org/10.5194/ejm-36-615-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/ejm-36-615-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Evidence of the existence of the As4S6 molecule produced by light exposure of alacranite, As8S9
Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, 50121 Florence, Italy
Paola Bonazzi
Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, 50121 Florence, Italy
deceased, 18 March 2024
Laura Chelazzi
CRIST – Centro di Cristallografia Strutturale, Via della Lastruccia 13, 50019 Sesto Fiorentino,Florence, Italy
Matteo M. N. Franceschini
Dipartimento di Scienze dell'Antichità, Sapienza Università di Roma, Piazzale Aldo Moro 5,00185 Rome, Italy
CNR – Istituto di Scienze del Patrimonio Culturale, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Florence, Italy
Giovanni O. Lepore
Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, 50121 Florence, Italy
Marta Morana
Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, 50121 Florence, Italy
Giovanni Pratesi
Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, 50121 Florence, Italy
Alice Taddei
Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, 50121 Florence, Italy
Matteo Zoppi
Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, 50121 Florence, Italy
Silvio Menchetti
Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, 50121 Florence, Italy
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A new rare-earth-bearing silicate is described from a manganese ore deposit in the Pyrenees. It belongs to the epidote family and is characterised by the formula Mn2+Ce(MgAlMn2+)(Si2O7)(SiO4)F(OH). This new mineral commonly contains inclusions of an Mn-rich yttrium borosilicate, a potentially new mineral of the hellandite family. This is a new type of occurrence for hellandite – while rare earths are under the spotlight.
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A new rare-earth-bearing silicate is described from a manganese ore deposit in the Pyrenees. It belongs to the epidote family and is characterised by the formula Mn2+Ce(MgAlMn2+)(Si2O7)(SiO4)F(OH). This new mineral commonly contains inclusions of an Mn-rich yttrium borosilicate, a potentially new mineral of the hellandite family. This is a new type of occurrence for hellandite – while rare earths are under the spotlight.
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Chromites found within the fusion crust of ordinary-chondrite meteorites display significant differences with respect to chromites found in the interior of the same meteorites. Chromites within the fusion crust, when compared to those in the interior of the meteorite, display a significantly higher Mg / (Mg + Fe) ratio; moreover, ca. 15 % of the chromites formed within the crust display small but detectable amounts of Ni.
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A thorough multimethod characterisation of the green dolomite sampled at the Malentrata magnesite mine has been carried out. We observed (1) a peculiar reduction of the cell volume and (2) the origin of the peculiar green colour, mainly determined by the Fe electronic transitions, probably in combination with those of Cr. In fact, the green dolomite of Malentrata contains aliquots of a number of environmentally relevant elements, in particular Mn, Cr, and Ni.
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Short summary
The As4S6 molecule was missing in the reported structures of crystalline As chalcogenides. Here we report the first occurrence of the As4S6 molecule together with the other known As4Sn (n = 3, 4, 5) molecules randomly replacing each other in the crystalline structure of a new monoclinic product obtained by the light-induced alteration of the mineral alacranite, As8S9.
The As4S6 molecule was missing in the reported structures of crystalline As chalcogenides. Here...