Corrensite from Nasławice (Lower Silesia, Poland): Some Problems of Mineral Identification and Origin
The corrensite from a chlorite vein-like rodingite blackwall in serpentinites has been studied. The proper identification of swelling layers in corrensite using heating at 500°C was ambiguous because of the spontaneous rehydration. Even K+-saturated samples heated to 500°C readily rehydrated after being cooled. This can be prevented if XRD patterns are recorded at 300°C, without cooling the sample. A standard heating at 500°C can result in partial decomposition of brucite-like sheet as evidenced by ASN simulation.
The ASN-calculated XRD patterns of contracted corrensite proved that an inhomogeneous distribution of heavy atoms (Fe, Ni, Mn, Cr etc.) between brucite-like sheet and talc-like layers and between two adjacent corrensite units in the interstratified mineral may result in the disappearance of low angle reflections (24 Å and 12 Å), which can lead to miscellaneous interpretation if distribution of heavy cations is not checked.
The corrensite occurred together with regular chlorite. However, it is assumed to be formed due to direct crystallization from late hydrothermal solutions as deduced from comparison of the Mg/(Mg + Fe) ratio in the corrensite, serpentinite and chlorite.
Key WordsCalculated X-ray patterns Corrensite Thermal contraction X-ray powder diffraction
Unable to display preview. Download preview PDF.
- Bailey, S. W. 1980. Structures of layer silicates. In Crystal Structure of Clay Minerals and their X-ray Identification. G. W. Brindley and G. Brown, eds. London: Mineralogical Society Monograph 5, 1–123.Google Scholar
- Bailey S. W. 1982. Nomenclature for regular interstratifications. A report of the AIPEA Nomenclature Committee presented by S. W. Bailey and adopted by General Assembly of AIPEA on September 12th 1981. Supplement to AIPEA Newsletters, 18: 1–12.Google Scholar
- Bodine, M. W., and B. M. Madsen. 1987. Mixed-layer chlorite/smectites from a Pennsylvania evaporite cycle, Grand County, Utah. Proc. Internati. Clay Conf. Denver 1985. H. van Olphen and F. Mumpton, eds. Bloomington, Indiana: The Clay Minerals Society, 85–93.Google Scholar
- Denoyer de Segonzac, D. G. de. 1969. Les minéraux argil-leux dans la diagènese-passage au mrtamorphisme. Mém. Serv. Carte Géol. Als. Lorr. 29: 1–320.Google Scholar
- Drits, V. A., and A. G. Kossovskaya. 1990. Clay Minerais: Smectites, Mixed-Layer Silicates (in Russian): Trans. Acad. Sci. U.S.S.R. 446: 1–214.Google Scholar
- Drits, V. A., and B. A. Sakharov. 1976. X-ray Structural Analysis of Mixed-layer Minerals (in Russian). Trans. Acad. Sci. U.S.S.R., 295: 1–252.Google Scholar
- Drits, V. A., and C. Tchoubar. 1990. X-ray Diffraction by Disordered Lamellar Structures. New York: Springer-Verlag, 1–371.Google Scholar
- Dubińska, E. 1984. Interstratified minerals with chlorite layers from Szklary near Ząbkowice Śląskie (Lower Silesia). Arch. Mineral. 39: 5–23.Google Scholar
- Dubińska, E. 1989. Clinozoisitic rodingites from Naslawice near Sobótka (Lower Silesia) Arch. Mineral 44: 41–54.Google Scholar
- Dubińska, E. 1995. Rodingites of the eastern part of Jor-danów-Gogo⌈ów serpentinite massif. Canad. Mineral. 33: 585–608.Google Scholar
- Inoue A., and M. Utada. 1991. Smectite-to-chlorite transformation in thermally metamorphosed volcanoclastic rocks in the Kamikita area, northeastern Honshu, Japan. Amer. Mineral. 76: 628–649.Google Scholar
- Johnson, L. J. 1964. Occurrence of regularly interstratified chlorite-vermiculite as a weathering product of chlorite in a soil. Amer. Mineral. 49: 552–572.Google Scholar
- Khamkhadze, N. I., V. A. Drits, L. G. Daynyak, M. V. Slonimskaya, and A. L. Sokolova. 1981. New variety of mixed-layered chlorite-montmorillonite from Cretateous volca-nogenic series of Adzharo-Trialepskoy zone of Georgia (in Russian). Lithology and Economic Deposits 1: 130–135.Google Scholar
- Lippmann F., and H.-G. Pankau. 1988. Der Mineralbestand des mittleren Muschelkalkes von Nagold, Württemberg. N. Jb. Miner. Abh. 158: 257–292.Google Scholar
- Lippmann F., and H. Rothfuss. 1980. Tonminerale in Tav-eyannaz-Sandsteinen. Schweiz, mineral, petr. Mitt. 60: 1–29.Google Scholar
- MacEvan, D. M. C., and M. J. Wilson. 1980. Interlayer and intercalation complexes of clay minerals. Crystal Structures of Clay Minerals and Their X-ray Identification. G. W. Brindley and G. Brown, eds. Mineralogical Society Monograph 5, London: Mineralogical Society, 197–248.Google Scholar
- Mejsner, J. 1977. Regularly interstratified chlorite-swelling chlorite (corrensite) varieties from the Taro Valley, Italy. Arch. Mineral. 33: 13–24.Google Scholar
- Nakamuta, Y. 1981. A regularly interstratified chlorite/vermiculite in a talc-chlorite vein. Mem. Fac. Sci. Kyushu Univ., s. D: Geology 14: 253–279.Google Scholar
- Nishiyama T., K. Oinuma, and M. Sato. 1979. An interstratified chlorite-vermiculite in weathered red shale near Toyoma, Japan. International Clay Conference 1978, Oxford. M. M. Mortland and V. C. Farmer, eds. Developments in Sedimentology 27. Elsevier, 85–94.Google Scholar
- Robinson D., R. E. Bevins, and G. Rowbotham. 1993. The characterization of mafic phyllosilicates in low-grade me-tabasalts from eastern north Greenland. Amer. Mineral. 78: 377–399.Google Scholar
- Shikazono N., and H. Kawahata. 1987. Compositional differences in chlorite from hydrothermally altered rocks and hydrothermal ore deposits. Can. Mineral. 25: 465–474.Google Scholar
- Shirozu H., T. Sakesegawa, N. Katsumoto, and M. Ozaki. 1975. Mg-chlorite and interstratified Mg-chlorite/saponite associated with Kuroko deposits. Clay Sci. 4: 305–321.Google Scholar