Articles | Volume 37, issue 4
https://doi.org/10.5194/ejm-37-517-2025
https://doi.org/10.5194/ejm-37-517-2025
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28 Jul 2025
Research article | Highlight paper |  | 28 Jul 2025

When colour makes minerals unique: the case of the green dolomite from Malentrata (Pomarance, Tuscany, Italy)

Luca Adami, Matteo Ardit, Costanza Bonadiman, Michele Dondi, Maura Mancinelli, Giovanni Orazio Lepore, Elena Spagnoli, Luca Nodari, Renzo Tassinari, Alfonso Zoleo, Giordano Montegrossi, and Francesco Di Benedetto

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Cited articles

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Antao, S. M., Mulder, W. M., Hassan, I., Richton, W. A., and Parise, J. B.: Cation disorder in dolomite, CaMg(CO3)2, and its influence on the aragonite + magnesite > dolomite reaction boundary, Am. Mineral., 89, 1142–1147, 2004. 
Bayyareddy, J. and Frost, R. L.: Electronic and vibrational spectra of gaspeite, Neues Jahrb. Mineral. Abh., 11, 525–536, 2004. 
Beran, A. and Zemann, J.: Refinement and comparison of the crystal structures of a dolomite and of an Fe-rich ankerite, Tschermaks Mineral. Petrogr. Mitteilungen, 24, 279–286, https://doi.org/10.1007/BF01081130, 1977. 
Boschi, C., Dini, A., Dallai, L., Ruggieri, G., and Gianelli, G.: Enhanced CO2-mineral sequestration by cyclic hydraulic fracturing and Si-rich fluid infiltration into serpentinites at Malentrata (Tuscany, Italy), Chem. Geol., 265, 209–226, https://doi.org/10.1016/j.chemgeo.2009.03.016, 2009. 
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Short summary
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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