none 10.1180/0026461036730113 Mineralogical Society The Mineralogical Society 7149 8020570 5840 2021020407235648107 10.1180 2021-02-04T02:36:02Z 2003-06-19T17:29:15Z 9 Mineralogical Magazine Mineral. mag. 0026-461X 1471-8022 06 2003 67 3 S. Tetsopgang J. Koyanagi M. Enami K. Kihara Abstract Hydroxylian pseudorutile in an adamellite from Cameroon has been identified using EPMA, FT-IR and single-crystal XRD analysis. TiO 2 and Fe 2 O 3 contents range between 60.6 and 67.9 wt.% and 22.2 and 36.5 wt.%, respectively, and totals vary from 90.1 to 98.1 wt.%. The SiO 2 (0.03 —1.40 wt.%), Al 2 O 3 (0.02—0.68 wt.%) and CaO (0.03—0.44 wt.%) contents increase systematically and MnO (0.04—0.69 wt.%) decreases slightly with decreasing Fe 3+ /Ti values. The MgO content is <0.06 wt.%. H 2 O contents (1.3—7.5 wt.%) are greater in parts of crystals with lower Fe 3+ /Ti, suggesting solid solution between the end-members Fe 3+ 2 Ti 3 O 9 and Fe 3+ Ti 3 O 6 (OH) 3 . The lattice parameters are a = 2.85 Å and c = 4.57 Å with hexagonal symmetry and point group 6/mmm. 07 05 2018 06 2003 509 516 S0026461X00007970 https://www.cambridge.org/core/terms 10.1180/0026461036730113 https://www.cambridge.org/core/product/identifier/S0026461X00007970/type/journal_article https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0026461X00007970 http://minmag.geoscienceworld.org/cgi/doi/10.1180/0026461036730113 10.1346/CCMN.1984.0320504 10.1016/0037-0738(91)90055-I 10.1180/minmag.1994.058.393.07 Bulletin de la Societé Géologique de France, Pétrographie et géochronologie Rb/Sr des granites cambriens de Goutchhoumi et d’;Anloa (Cameroun). 23 511 1984 Lasserre Journal of Earth and Planetary Sciences Nagoya University, Preliminary CHIME dating of granites from the Nkambe area, northwestern Cameroon, Africa. 46 57 1999 Tetsopgang 10.1346/CCMN.1994.0420508 10.1180/minmag.1983.047.343.10 American Mineralogist, Hydrothermal synthesis of goethite-rutile intergrowth structures and their relationship to pseudorutile 68 981 1983 Grey 10.2113/gsecongeo.61.4.695 Mineral Deposits 709 1997 Chernet American Mineralogist, The structure of pseudorutile and its role in the natural alteration of ilmenite 60 898 1975 Grey 10.1007/978-1-4615-3678-9 Hey's Mineral Index, Mineral Species, Varieties and Synonyms. 848 1993 Clark 10.1038/211179b0