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Hydroxylian pseudorutile in an adamellite from the Nkambe area, Cameroon

¹ Department of Earth and Planetary Sciences, Nagoya University, Nagoya 464-8602, Japan
² Department of Earth Sciences, Kanazawa University, Kanazawa 920-1192, Japan

^* E-mail: enami{at}eps.nagoya-u.ac.jp

Hydroxylian pseudorutile in an adamellite from Cameroon has been identified using EPMA, FT-IR and single-crystal XRD analysis. TiO₂ and Fe₂O₃ 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 SiO₂ (0.03–1.40 wt.%), Al₂O₃ (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 Fe³⁺/Ti values. The MgO content is <0.06 wt.%. H₂O contents (1.3–7.5 wt.%) are greater in parts of crystals with lower Fe³⁺/Ti, suggesting solid solution between the end-members Fe³⁺₂Ti₃O₉ and Fe³⁺Ti₃O₆(OH)₃. The lattice parameters are a = 2.85 Å and c = 4.57 Å with hexagonal symmetry and point group 6/mmm.

KEYWORDS: pseudorutile, ilmenite, Cameroon