Odinite, a new dioctahedral-trioctahedral Fe3+-rich 1:1 clay mineral

Abstract Odinite is a Fe3+-rich green clay that is widespread in the form of infillings or replacements of microtests, bioclasts, faecal pellets, or mineral debris on shallow marine shelfs and reef lagoonal areas in tropical latitudes. The structure is based on a 1 : 1 serpentine-type layer that is intermediate between dioctahedral and trioctahedral. Octahedral cation totals range from 2·30 to 2·54 cations per 3·0 sites for 10 samples. The structural formula for the purest sample is Both monoclinic and trigonal polytypes are present in most samples, with 1M more abundant than 1T. Unit-cell dimensions are 1M: a = 5·373(3), b = 9·326(7), c = 7·363(6) Å, β = 104·0(1)°; 1T: a = 5·366(5), b = 9·334(9), c = 7·161(8), β = 90° (on orthohexagonal axes). The name is for Dr. Gilles Serge Odin, Département de Géologie Dynamique, Université Pierre et Marie Curie, Paris, who has done most of the pioneering work on this new mineral.

[1]  Haruo Shirozu.  X-RAY POWDER PATTERNS AND CELL DIMENSIONS OF SOME CHLORITES IN JAPAN, WITH A NOTE ON THEIR INTERFERENCE COLORS , 1958 .

[2]  S. W. Bailey,et al.  Chlorite polytypism: i. regular and semi-random one-layer structures , 1962 .

[3]  M. D. Foster.  Interpretation of the composition and a classification of the chlorites , 1962 .

[4]  S. W. Bailey.  Polytypism of Trioctahedral 1:1 Layer Silicates , 1969 .

[5]  黒田 三郎.  PORRENGA,D.,H.:Clay Mineralogy and Geochemistry of Recent Marine Sediments in Tropical Areas , 1970 .

[6]  V. Farmer.  The Infrared spectra of minerals , 1974 .

[7]  D. Bish,et al.  Interlayer bonding in IIb chlorite , 1981 .

[8]  A. Matter,et al.  De glauconiarum origine , 1981 .

[9]  G. Brindley.  Chemical Compositions of Berthierines—A Review , 1982 .

[10]  S. W. Bailey,et al.  Structural aspects of greenalite and related minerals , 1982 .

[11]  S. W. Bailey,et al.  Crystal Structure of Cronstedtite-2H2 , 1983 .

[12]  G. Odin.  La «verdine», faciès granulaire vert, marin et côtier, distinct de la glauconie: distribution actuelle et composition , 1985 .

[13]  G. Odin,et al.  Chapter B2 The Verdine Facies from the Senegalese Continental Shelf , 1988 .

[14]  G. Odin.  Chapter B1 The Verdine Facies from the Lagoon off New Caledonia , 1988 .

[15]  S. W. Bailey.  X-Ray Diffraction Identification of the Polytypes of Mica, Serpentine, and Chlorite , 1988 .

[16]  G. Odin,et al.  Chapter B6 Geological Significance of the Verdine Facies , 1988 .

[17]  S. W. Bailey,et al.  Mineralogy of the verdine facies , 1989 .