| TVRDÝ, Jaromír, Luboš VRTIŠKA, Jan FILIP, Zdeněk DOLNÍČEK, Radek ŠKODA, Martin PETR and Radana MALÍKOVÁ. Manganrockbridgeite from the Jocão claim, Conselheiro Pena, Minas Gerais, Brazil: chemistry, spectroscopic and structural data. Journal of Geosciences. Czech Geological Survey, 2024, vol. 69, No 2, p. 87-98. ISSN 1802-6222. Available from: https://dx.doi.org/10.3190/jgeosci.387. |
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@article{2420223,
author = {Tvrdý, Jaromír and Vrtiška, Luboš and Filip, Jan and Dolníček, Zdeněk and Škoda, Radek and PETR, Martin and Malíková, Radana},
article_number = {2},
doi = {http://dx.doi.org/10.3190/jgeosci.387},
keywords = {manganrockbridgeite; phosphate minerals; Jocão pegmatite; Minas Gerais; Brazil},
language = {eng},
issn = {1802-6222},
journal = {Journal of Geosciences},
title = {Manganrockbridgeite from the Jocão claim, Conselheiro Pena, Minas Gerais, Brazil: chemistry, spectroscopic and structural data},
url = {http://www.jgeosci.org/content/jgeosci_387_Tvrdy.pdf},
volume = {69},
year = {2024}
}
TY - JOUR
ID - 2420223
AU - Tvrdý, Jaromír - Vrtiška, Luboš - Filip, Jan - Dolníček, Zdeněk - Škoda, Radek - PETR, Martin - Malíková, Radana
PY - 2024
TI - Manganrockbridgeite from the Jocão claim, Conselheiro Pena, Minas Gerais, Brazil: chemistry, spectroscopic and structural data
JF - Journal of Geosciences
VL - 69
IS - 2
SP - 87-98
EP - 87-98
PB - Czech Geological Survey
SN - 18026222
KW - manganrockbridgeite
KW - phosphate minerals
KW - Jocão pegmatite
KW - Minas Gerais
KW - Brazil
UR - http://www.jgeosci.org/content/jgeosci_387_Tvrdy.pdf
N2 - The world's second occurrence of the recently described manganrockbridgeite was found in a mineral assemblage in the Jocão (Cigana) pegmatite, Conselheiro Pena district, Minas Gerais (Brazil). Manganrockbridgeite forms green botryoidal-crystalline crusts with a velvety surface covering the walls of leached cavities in triphylite replaced by correianevesite and Mn-rich vivianite. The outer zone is significantly richer in Mn than the inner zone where the manganrockbridgeite passes to frondelite. Other associated minerals are hureaulite and kenngottite-like phosphate. Empirical formulae based on EPMA, Mössbauer and XPS spectroscopy are (Mn1.36Fe2+0.46Fe3+0.09Ca0.03Mg0.01□0.05)Σ2.00Fe3+2.95(PO4)3.00(OH)3.84(H2O)1.16 for the outer zone and (Mn1.03Fe2+0.49Fe3+0.29Ca0.03Mg0.02□0.14)Σ2.00Fe3+2.94(PO4)3.00(OH)3.81(H2O)1.19 for the inner zone of aggregates. Raman spectra and assignment of individual decomposed bands to vibrational modes show a good agreement with data published for frondelite from the Jocão locality. By powder diffraction data the studied manganrockbridgeite corresponds to the type material from Hagendorf-Süd, Germany. Unit-cell parameters for space group P21/m are a = 5.195(2) Å, b = 16.936(4) Å, c = 7.452(2) Å, β = 110.25(3)° and V = 615.1(4) Å3.
ER -
TVRDÝ, Jaromír, Luboš VRTIŠKA, Jan FILIP, Zdeněk DOLNÍČEK, Radek ŠKODA, Martin PETR and Radana MALÍKOVÁ. Manganrockbridgeite from the Jocão claim, Conselheiro Pena, Minas Gerais, Brazil: chemistry, spectroscopic and structural data. \textit{Journal of Geosciences}. Czech Geological Survey, 2024, vol.~69, No~2, p.~87-98. ISSN~1802-6222. Available from: https://dx.doi.org/10.3190/jgeosci.387.
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