Titre du document / Document title

Hydroxylian pseudorutile in an adamellite from the Nkambe area, Cameroon

Auteur(s) / Author(s)

TETSOPGANG S. ; KOYANAGI J. ; ENAMI M. ; KIHARA K. ;

Résumé / Abstract

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 A and c = 4.57 Å with hexagonal symmetry and point group 6/mmm.

Revue / Journal Title

Mineralogical Magazine   ISSN 0026-461X   CODEN MNLMBB 

Source / Source

2003, vol. 67, n^o3, pp. 509-516 [8 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

Mineralogical Society, London, ROYAUME-UNI  (1969) (Revue)

Localisation / Location

INIST-CNRS, Cote INIST : 3052, 35400011132017.0050