| Reference Type | Journal (article/letter/editorial) |
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| Title | Ammonium-Bearing Fluorapophyllite-(K) in the Magnesian Skarns from Aleului Valley, Pietroasa, Romania |
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| Journal | Minerals |
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| Authors | Marincea, Ştefan | Author |
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| Dumitraş, Delia-Georgeta | Author |
| Sava Ghineţ, Cristina | Author |
| Filiuţă, Andra Elena | Author |
| Dal Bo, Fabrice | Author |
| Hatert, Frédéric | Author |
| Costin, Gelu | Author |
| Year | 2023 (October 25) | Volume | < 13 > |
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| Page(s) | 1362 | Issue | < 11 > |
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| Publisher | MDPI AG |
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| URL | |
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| DOI | doi:10.3390/min13111362Search 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 | 16900200 | Long-form Identifier | mindat:1:5:16900200:0 |
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| GUID | 0 |
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| Full Reference | Marincea, Ştefan; Dumitraş, Delia-Georgeta; Sava Ghineţ, Cristina; Filiuţă, Andra Elena; Dal Bo, Fabrice; Hatert, Frédéric; Costin, Gelu (2023) Ammonium-Bearing Fluorapophyllite-(K) in the Magnesian Skarns from Aleului Valley, Pietroasa, Romania. Minerals, 13 (11). 1362 doi:10.3390/min13111362 |
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| Plain Text | Marincea, Ştefan; Dumitraş, Delia-Georgeta; Sava Ghineţ, Cristina; Filiuţă, Andra Elena; Dal Bo, Fabrice; Hatert, Frédéric; Costin, Gelu (2023) Ammonium-Bearing Fluorapophyllite-(K) in the Magnesian Skarns from Aleului Valley, Pietroasa, Romania. Minerals, 13 (11). 1362 doi:10.3390/min13111362 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | An ammonium-bearing fluorapophyllite-(K) occurs as a late hydrothermal product in the outer endoskarn zone from Aleului Valley (N 46°37′04″, E 22°35′22″), located at the contact of the granodiorite laccolith from Pietroasa, of Upper Cretaceous age, with Anisian dolostones. Associated minerals are wollastonite, K feldspar, diopside, fluorapatite, talc, and pectolite. The chemical structural formula is [K0.985Na0.012(NH4)0.076]Σ=1.073(Ca4.009Mn0.001Fe2+0.003Mg0.002Ba0.001)Σ=4.016(Si7.953Al0.047) O20.029[F0.899(OH)0.101]·8.059H2O. The structure was successfully refined as tetragonal, space group P4/mnc, with cell parameters of a = 8.9685(1) Å and c = 15.7885(5) Å. The indices of refraction are ω = 1.534(1) and ε = 1.536(1). The calculated density is Dx = 2.381 g/cm3, in good agreement with the measured density, Dm = 2.379(4) g/cm3. The thermal analysis shows that the mineral completely dehydrates at up to 450 °C (endothermic effects at 330, 371, and 448 °C) and loses ammonium at 634 °C. In the infrared spectra, the multiplicity of the bands assumed to be silicate modes (1ν1 + 3ν3 + 2ν2 + 3ν4) agrees with the reduction in the symmetry of the SiO44− ion from Td to Cδ. Fluorapophyllite-(K) from Aleului Valley is of late hydrothermal origin and crystallized from F-rich fluids originating from the granodiorite intrusion, which mobilized K, Ca, and Si from the pre-existing feldspar. |
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