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Jahnsite-(MnMnMg), Mn2+Mn2+Mg2+2Fe3+2(PO4)4(OH)2·8H2O, a New Phosphate Mineral Species from Sapucaia Pegmatite, Sapucaia Do Norte, Galiléia, Minas Gerais, Brazil

2019; Mineralogical Association of Canada; Volume: 57; Issue: 3 Linguagem: Inglês

10.3749/canmin.1800078

1499-1276

Pietro Vignola, Frédéric Hatert, Maxime Baijot, Nicola Rotiroti, Andrea Risplendente, Sergio Varvello,

Chemical Synthesis and Characterization

Research Article| May 16, 2019 Jahnsite-(MnMnMg), Mn2+Mn2+Mg2+2Fe3+2(PO4)4(OH)2·8H2O, a New Phosphate Mineral Species from Sapucaia Pegmatite, Sapucaia Do Norte, Galiléia, Minas Gerais, Brazil Pietro Vignola; Pietro Vignola § CNR-Istituto per la dinamica dei processi ambientali, via Mario Bianco, 9, I-20131 Milano, Italia §Corresponding author e-mail address: pietro.vignola@idpa.cnr.it, pietroevignola@gmail.com Search for other works by this author on: GSW Google Scholar Frédéric Hatert; Frédéric Hatert Laboratoire de Minéralogie, Département de Géologie, Université de Liège, Bâtiment B18, Sart Tilman, B-4000 Liège, Belgique Search for other works by this author on: GSW Google Scholar Maxime Baijot; Maxime Baijot Laboratoire de Minéralogie, Département de Géologie, Université de Liège, Bâtiment B18, Sart Tilman, B-4000 Liège, Belgique Search for other works by this author on: GSW Google Scholar Nicola Rotiroti; Nicola Rotiroti Dipartimento di Scienze della Terra, Università degli Studi di Milano, via Botticelli 23, I-20133 Milano, Italia Search for other works by this author on: GSW Google Scholar Andrea Risplendente; Andrea Risplendente Dipartimento di Scienze della Terra, Università degli Studi di Milano, via Botticelli 23, I-20133 Milano, Italia Search for other works by this author on: GSW Google Scholar Sergio Varvello Sergio Varvello Vai De Vit 17 – 28838, Stresa, Italia Search for other works by this author on: GSW Google Scholar Author and Article Information Pietro Vignola § CNR-Istituto per la dinamica dei processi ambientali, via Mario Bianco, 9, I-20131 Milano, Italia Frédéric Hatert Laboratoire de Minéralogie, Département de Géologie, Université de Liège, Bâtiment B18, Sart Tilman, B-4000 Liège, Belgique Maxime Baijot Laboratoire de Minéralogie, Département de Géologie, Université de Liège, Bâtiment B18, Sart Tilman, B-4000 Liège, Belgique Nicola Rotiroti Dipartimento di Scienze della Terra, Università degli Studi di Milano, via Botticelli 23, I-20133 Milano, Italia Andrea Risplendente Dipartimento di Scienze della Terra, Università degli Studi di Milano, via Botticelli 23, I-20133 Milano, Italia Sergio Varvello Vai De Vit 17 – 28838, Stresa, Italia §Corresponding author e-mail address: pietro.vignola@idpa.cnr.it, pietroevignola@gmail.com Publisher: Mineralogical Association of Canada First Online: 06 May 2019 Online Issn: 1499-1276 Print Issn: 0008-4476 © 2019 Mineralogical Association of Canada The Canadian Mineralogist (2019) 57 (3): 363–370. https://doi.org/10.3749/canmin.1800078 Article history First Online: 06 May 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Pietro Vignola, Frédéric Hatert, Maxime Baijot, Nicola Rotiroti, Andrea Risplendente, Sergio Varvello; Jahnsite-(MnMnMg), Mn2+Mn2+Mg2+2Fe3+2(PO4)4(OH)2·8H2O, a New Phosphate Mineral Species from Sapucaia Pegmatite, Sapucaia Do Norte, Galiléia, Minas Gerais, Brazil. The Canadian Mineralogist 2019;; 57 (3): 363–370. doi: https://doi.org/10.3749/canmin.1800078 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyThe Canadian Mineralogist Search Advanced Search Abstract Jahnsite-(MnMnMg), Mn2+Mn2+Mg2+2Fe3+2(PO4)4(OH)2·8H2O, is a new phosphate mineral belonging to the jahnsite subgroup contained in the jahnsite group of minerals. It was found in the dumps of the Sapucaia pegmatite, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil by one of the authors (SV). The mineral occurs on the surfaces of hydrothermal cavities and is associated with frondelite, mangangordonite, and leucophosphite. It forms prisms weakly elongated along a, flattened on [010], and twinned by reflection on {001} up to 200 μm in length. The new species is a late stage alteration product of primary phosphates such as triphylite. Its color is yellow to honey-colored or greenish-yellow and it is partially transparent with a vitreous luster. The streak is very pale yellow. Jahnsite-(MnMnMg) is brittle with good cleavage on {001} and irregular fracture. Its inferred Mohs hardness is 4 and the calculated density is 2.625 g/cm3. The mineral is optically biaxial (–) with α = 1.616, β = 1.619, γ = 1.656 and 2V (calc.) = 74° and non-fluorescent under 254 nm (short wave) and 366 nm (long wave). The empirical formula is: (Mn0.50Ca0.25Na0.20)Σ0.95Mn(Mg1.26Mn0.52Fe2+0.21Zn0.01)Σ2(Fe3+1.63Al0.37)Σ2(PO4)4(OH)1.70·8H2O. The endmember formula is Mn2+Mn2+Mg2+2Fe3+2(PO4)4(OH)2·8H2O. Jahnsite-(MnMnMg) is monoclinic, with space group P2/a and unit-cell parameters a 15.177(2) Å, b 7.176(1) Å, c 10.006(3) Å, and β 110.01(2)° with V 1017.3(2) Å3 for Z = 2. Its crystal structure was refined and the mineral is isostructural with other members of the jahnsite group. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.