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@article{1579516, author = {Kampf, Anthony R. and Alves, Pedro and Kasatkin, Anatoly and Škoda, Radek}, article_location = {Stuttgart}, article_number = {1}, doi = {http://dx.doi.org/10.1127/ejm/2018/0030-2800}, keywords = {Jahnsite-(MnMnZn); new mineral; jahnsite-group; crystal structure; Raman spectroscopy; Herdade dos Pendoes mine; Portugal}, language = {eng}, issn = {0935-1221}, journal = {European Journal of Mineralogy}, title = {Jahnsite-(MnMnZn), a new jahnsite-group mineral, and formal approval of the jahnsite group}, url = {https://pubs.geoscienceworld.org/eurjmin/article-abstract/31/1/167/548185/Jahnsite-MnMnZn-a-new-jahnsite-group-mineral-and?redirectedFrom=fulltext}, volume = {31}, year = {2019} }
TY - JOUR ID - 1579516 AU - Kampf, Anthony R. - Alves, Pedro - Kasatkin, Anatoly - Škoda, Radek PY - 2019 TI - Jahnsite-(MnMnZn), a new jahnsite-group mineral, and formal approval of the jahnsite group JF - European Journal of Mineralogy VL - 31 IS - 1 SP - 167-172 EP - 167-172 PB - E SCHWEIZERBARTSCHE VERLAGSBUCHHANDLUNG SN - 09351221 KW - Jahnsite-(MnMnZn) KW - new mineral KW - jahnsite-group KW - crystal structure KW - Raman spectroscopy KW - Herdade dos Pendoes mine KW - Portugal UR - https://pubs.geoscienceworld.org/eurjmin/article-abstract/31/1/167/548185/Jahnsite-MnMnZn-a-new-jahnsite-group-mineral-and?redirectedFrom=fulltext L2 - https://pubs.geoscienceworld.org/eurjmin/article-abstract/31/1/167/548185/Jahnsite-MnMnZn-a-new-jahnsite-group-mineral-and?redirectedFrom=fulltext N2 - Jahnsite-(MnNInZn) (IMA2017-113), Mn(2)(2+)Zn2Fe(3)(2+)(PO4)(4)(OH)(2) center dot 8H(2)O, is a new member of the jahnsite group from the Herdade dos Pendries mine, Beja district, southwest Portugal. It formed in a highly altered gossan in association with Zn-bearing libethenite, quartz, rhodochrosite and santabarbaraite. It occurs in sub-parallel bundles of light golden brown prisms up to 0.3 mm long. Crystals are transparent with vitreous to silky lustre and white streak. The mineral is brittle with irregular, splintery fracture, good cleavage parallel to {001} and Mohs' hardness of about 4. The measured density is 2.89(2) g cm(-3). Optically, it is biaxial (+), with alpha = 1.655(2), beta = 1.662(2), gamma = 1.673(2) (white light); 2V = 78(1)degrees; pleochroism: X nearly colourless, Y and Z beige; X < Y approximate to Z. Electron microprobe analyses gave the empirical formula (Mn0.712+Na0.15Ca0.10)Sigma(0.96) (Mn-1.00(2+)) (Zn1.00Mn0.662+Fe0.212+Mg0.10Fe0.033+)(Sigma 2.00)(Fe1.993+Al0.01)(Sigma 2.00)(P1.01O4)(4)(OH)(2) center dot 8H(2)O. Jahnsite-(MnMnZn) is monoclinic, P2/a, a = 15.222(6), b = 7.187(6), c = 10.028(5) angstrom, beta = 111.746(16)degrees, V = 1019.0(11) angstrom(3) and Z = 2. The eight strongest lines in the X-ray powder diffraction pattern are [d(obs)/angstrom (I) (hkl)]: 9.25 (63) (001), 5.00 (40) (210,21 (1) over bar ,111), 4.648 (33) (002), 3.509 (41) (40 (2) over bar), 2.842 (100) (022), 1.9984 (37) (422,42 (4) over bar), 1.9506 (30) (024) and 1.5853 (33) (820,82 (4) over bar). The jahnsite group has now been officially established by the Commission on New Minerals, Nomenclature and Classification. The general formula for jahnsite-group minerals is XM1M2(2)M3(2)(H2O)(8)(OH)(2)(PO4)(4); the ionic radii for the cation sites generally increase as follows: M3 < M2 < M1 < X, and the M3 site determines whether the species belongs to the jahnsite subgroup (M3 = Fe3+) or the whiteite subgroup (M3 = Al). The subgroup name is generally used as the species root name to be followed by a suffix of the form-(XM1M2). Using this as a guide for the jahnsite described herein results in the following site assignments: X = Mn, M1 = Mn, M2 = Zn, and M3 = Fe; and the name jahnsite-(MnMnZn). ER -
KAMPF, Anthony R., Pedro ALVES, Anatoly KASATKIN a Radek ŠKODA. Jahnsite-(MnMnZn), a new jahnsite-group mineral, and formal approval of the jahnsite group. \textit{European Journal of Mineralogy}. Stuttgart: E SCHWEIZERBARTSCHE VERLAGSBUCHHANDLUNG, 2019, roč.~31, č.~1, s.~167-172. ISSN~0935-1221. Dostupné z: https://dx.doi.org/10.1127/ejm/2018/0030-2800.
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