| Reference Type | Journal (article/letter/editorial) |
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| Title | Dacostaite, K(Mg₂Al)[Mg(H₂O)₆]₂(AsO₄)₂F₆ ⋅2H₂O, a new fluoride–arsenate mineral from the Cetine di Cotorniano Mine (Tuscany, Italy) |
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| Journal | European Journal of Mineralogy |
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| Authors | Biagioni, C. | Author |
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| Mauro, D. | Author |
| Sejkora, J. | Author |
| Dolnı́ček, Z. | Author |
| Dini, A. | Author |
| Škoda, R. | Author |
| Year | 2025 | Volume | 37 |
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| Page(s) | 39-52 | Issue | 1 |
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| URL | |
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| DOI | doi:10.5194/ejm-37-39-2025Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 17942749 | Long-form Identifier | mindat:1:5:17942749:7 |
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| GUID | 0 |
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| Full Reference | Biagioni, C., Mauro, D., Sejkora, J., Dolnı́ček, Z., Dini, A., Škoda, R. (2025) Dacostaite, K(Mg₂Al)[Mg(H₂O)₆]₂(AsO₄)₂F₆ ⋅2H₂O, a new fluoride–arsenate mineral from the Cetine di Cotorniano Mine (Tuscany, Italy). European Journal of Mineralogy, 37 (1). 39-52 doi:10.5194/ejm-37-39-2025 |
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| Plain Text | Biagioni, C., Mauro, D., Sejkora, J., Dolnı́ček, Z., Dini, A., Škoda, R. (2025) Dacostaite, K(Mg₂Al)[Mg(H₂O)₆]₂(AsO₄)₂F₆ ⋅2H₂O, a new fluoride–arsenate mineral from the Cetine di Cotorniano Mine (Tuscany, Italy). European Journal of Mineralogy, 37 (1). 39-52 doi:10.5194/ejm-37-39-2025 |
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| In | (2025) European Journal of Mineralogy Vol. 37 (1). Schweizerbart |
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| Abstract/Notes | The new mineral dacostaite, K(Mg2Al)[Mg(H2O)6]2(AsO4)2F6 ⋅ 2H2O, has been discovered in the Cetine di Cotorniano Mine, Chiusdino, Siena, Tuscany, Italy. It occurs as thin, colourless-to-white pseudo-hexagonal micaceous crystals up to 0.5 mm in size. The streak is white, and the lustre is silky. The cleavage is perfect on {001}. The empirical formula of dacostaite, based on (As + P) = 2 atoms per formula unit, is (K0.56Ca0.04Na0.03□0.37)Σ1.00 (Al1.54Mg1.38Cu0.03Zn0.03)Σ2.98 [Mg(H2O)6]2 [(As0.99P0.01)O4]2 [F4.46(OH)1.46O0.08]Σ6.00 ⋅ 2H2O (Z=2). Dacostaite is monoclinic, with a space group of C2/m and a=12.474(5), b=7.198(3), c=13.724(6) Å, β=99.518(13)°, and V=1215.3(8) Å3. The crystal structure was solved using single-crystal X-ray diffraction data and refined to R1=0.0927 for 1022 unique reflections with Fo > 4σ (Fo). The crystal structure of dacostaite can be described as formed by heteropolyhedral {001} layers and isolated Mg(H2O)6 groups connected by H bonds. In the type material, dacostaite is associated with quartz, sulfur, gypsum, and a pharmacosiderite-like mineral in a small cavity of silicified limestone. Its genesis is related to the activity of oxidized (Al,F)-rich fluids during the late-stage evolution of the Sb ore deposit formerly exploited at the Cetine di Cotorniano Mine. |
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