Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 77. (Budapest 1985)
Szendrei, G. ; N. Tóth, M.: Contribution to the study on the crystallinity degree of kaolinites
Table 1. Mineralogical composition and total Fe 2 0 3 content of kaolinites from various localities Locality Mineralogical Total Fe 2 0 3 Locality composition content % 1 Sedlec — Czechoslovakia (Cs) kaolinite ) quartz ) 10 Â phyllosilicate 0.09 2 Cserszegtomaj — Hungary (H) kaolinite )) gibbsite 2.40 3 Királyhegy — Hungary (H) kaolinite ) quartz 0.86 4 Georgia — United States of America (USA) kaolinite > quartz 0.23 5 Keokuk — United States of America (USA) kaolinite ) quartz 0.09 6 Klösterle — Austria (A) quartz ) kaolinite 0.19 7 Sokolov — Czechoslovakia (Cs) quartz ) kaolinite ) 10 Á phyllosilicate 0.44 8 Vidnova — Czechoslovakia (Cs) quartz ) kaolinite 0.76 9 Rochlitz — German Democratic Republic kaolinite )) quartz ) (GDR) hematite 4.19 10 Passau — German Federal Republic (GFR) quartz ) kaolinite ) 10 Â phyllosilicate 0.26 11 Maria mine 1 — Poland (P) kaolinite ) quartz ) 10 Â phyllosilicate 0.51 12 Maria mine 2 — Poland (P) quartz ) kaolinite ) 10 Â phyllosilicate 0.21 13 Petrifalau — Roumania (R) kaolinite ) quartz > 10 Â phyllosilicate 0.64 14 Sasca-Montana — Roumania (R) kaolinite )) smectite 1.25 15 Ladoga lake — Soviet Union (SU) kaolinite )) quartz 0.35 16 Kovaso 1 — Soviet Union (SU) kaolinite ) quartz 0.07 17 Kovaso 2 — Soviet Union (SU) quartz > kaolinite 0.23 Georgia (MURRAY 1977), Maria mine I-II (GAWRONSKI & KOZYDRA 1969), Passau (GÜMBEL 1868), Petrifalau (HALAVATS & TELEGDI 1910), Rochlitz (STÖRR & SCHWERDTNER 1975a, b) Sedlec, Sokolov and Vidnova (KUZVART 1968, 1969) are of sedimentary origin. For the purposes of comparison the samples from Keokuk, Királyhegy and further from Cserszegtomaj and Sedlec were selected as reference minerals of hydrothermal and sedimentary origin. The geological conditions and mineralogical characteristics of the samples are not mentioned here, they are detailed in the given references. Estimation of qualitative mineralogical composition is based on the evaluation of X-ray diffractograms, taking into consideration the data of chemical and thermal analysis (Table 1). To determine the crystallinity indices mentioned above, CCI (complex crystallinity index), coherently scattering domain size and average deformation X-ray diffractometry was used. CCI is the average of crystallinity indices introduced by Hinckley, Brindley, Murray & Lyons, and Krantz. The various scales of these indices were unified by denoting the values of the most disordered structures as 100. These crystallinity studies were carried out using a Philips X-ray diffractometer. Recording conditions: CuK a radiation with 45 kV and 35 mA, detector: proportional counter, monochromator: graphite, divergency and detector slits: 1°, goniometer speed: l/2°/min., time constant: 2 sec, paper speed : 2 cm/min). The calculation of the data was carried out on a HT 680 X personal computer. The degree of order was calculated from the thermal parameters based on the principle given by SMYKATZ-KLOSS (1975). For the thermal analysis a Paulik-Paulik-Erdey type Derivatograph produced by the Hungarian Optical Works was used. Samples of 1.500 g were weighted in. A1 2 0 3 was used as reference material. The TG— , DTG, and DTA—sensitivity values were 500 mg, 1/10, 1/10, respectively. Heating rate was 10°C/minute. Total Fe 2 0 3 content was titanometrically determined after an alkali (Na 2 C0 3-K 2 C0 3 ) fusion and dissolution in hydrochloric acid, or was measured by Atomic Absorption Spectrometry with Variant Techton apparatus after a LiB0 2 fusion. The analysers were J. Lefler (Laboratory for Geochemical Research of the Hungarian Academy of Sciences) and G. Pitter (Hungarian Natural History Museum).
