Dacostaite, K(Mg2Al)[Mg(H2O)6]2(AsO4)2F6  ⋅  2H2O, a new
fluoride–arsenate mineral from the Cetine di Cotorniano Mine
(Tuscany, Italy)

J 2025

Dacostaite, K(Mg2Al)[Mg(H2O)6]2(AsO4)2F6 ⋅ 2H2O, a new fluoride–arsenate mineral from the Cetine di Cotorniano Mine (Tuscany, Italy)

BIAGIONI, Cristian; Daniela MAURO; Jiri SEJKORA; Zdenek DOLNICEK; Andrea DINI et. al.

Základní údaje

Originální název

Dacostaite, K(Mg2Al)[Mg(H2O)6]2(AsO4)2F6 ⋅ 2H2O, a new fluoride–arsenate mineral from the Cetine di Cotorniano Mine (Tuscany, Italy)

Autoři

BIAGIONI, Cristian; Daniela MAURO; Jiri SEJKORA; Zdenek DOLNICEK; Andrea DINI a Radek ŠKODA (203 Česká republika, domácí)

Vydání

European Journal of Mineralogy, Copernicus Publications, 2025, 0935-1221

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Německo

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 1.700 v roce 2024

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.5194/ejm-37-39-2025

UT WoS

001400555700001

EID Scopus

2-s2.0-85216414910

Klíčová slova anglicky

CRYSTAL-STRUCTURE; BOND-VALENCE; BLACK RANGE; NEW-MEXICO; VICANITE-(CE); BOROSILICATE; GLADSTONE; DURANGITE; DISTRICT; MEMBER

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 5. 3. 2025 10:33, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

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.

Citovat

BIAGIONI, Cristian; Daniela MAURO; Jiri SEJKORA; Zdenek DOLNICEK; Andrea DINI a Radek ŠKODA. 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. Copernicus Publications, 2025, roč. 37, č. 1, s. 39-52. ISSN 0935-1221. Dostupné z: https://doi.org/10.5194/ejm-37-39-2025.

@article{2481788,
   author = {Biagioni, Cristian and Mauro, Daniela and Sejkora, Jiri and Dolnicek, Zdenek and Dini, Andrea and Škoda, Radek},
   article_number = {1},
   doi = {https://doi.org/10.5194/ejm-37-39-2025},
   keywords = {CRYSTAL-STRUCTURE; BOND-VALENCE; BLACK RANGE; NEW-MEXICO; VICANITE-(CE); BOROSILICATE; GLADSTONE; DURANGITE; DISTRICT; MEMBER},
   language = {eng},
   issn = {0935-1221},
   journal = {European Journal of Mineralogy},
   title = {Dacostaite, K(Mg2Al)[Mg(H2O)6]2(AsO4)2F6 ⋅ 2H2O, a new fluoride–arsenate mineral from the Cetine di Cotorniano Mine (Tuscany, Italy)},
   url = {https://doi.org/10.5194/ejm-37-39-2025},
   volume = {37},
   year = {2025}
}

TY  - JOUR
ID  - 2481788
AU  - Biagioni, Cristian - Mauro, Daniela - Sejkora, Jiri - Dolnicek, Zdenek - Dini, Andrea - Škoda, Radek
PY  - 2025
TI  - Dacostaite, K(Mg2Al)[Mg(H2O)6]2(AsO4)2F6 ⋅ 2H2O, a new fluoride–arsenate mineral from the Cetine di Cotorniano Mine (Tuscany, Italy)
JF  - European Journal of Mineralogy
VL  - 37
IS  - 1
SP  - 39-52
EP  - 39-52
PB  - Copernicus Publications
SN  - 09351221
KW  - CRYSTAL-STRUCTURE
KW  - BOND-VALENCE
KW  - BLACK RANGE
KW  - NEW-MEXICO
KW  - VICANITE-(CE)
KW  - BOROSILICATE
KW  - GLADSTONE
KW  - DURANGITE
KW  - DISTRICT
KW  - MEMBER
UR  - https://doi.org/10.5194/ejm-37-39-2025
N2  - 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.
ER  -

BIAGIONI, Cristian; Daniela MAURO; Jiri SEJKORA; Zdenek DOLNICEK; Andrea DINI a Radek ŠKODA. Dacostaite, K(Mg2Al)[Mg(H2O)6]2(AsO4)2F6 ⋅ 2H2O, a new fluoride–arsenate mineral from the Cetine di Cotorniano Mine (Tuscany, Italy). \textit{European Journal of Mineralogy}. Copernicus Publications, 2025, roč.~37, č.~1, s.~39-52. ISSN~0935-1221. Dostupné z: https://doi.org/10.5194/ejm-37-39-2025.

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