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 2. Crystallinity parameters of the investigated kaolinites calculated from X-ray diffractograms Locality B f(001) CCI D(ooi) VV>xio 3 Locality (°20) % (Â) % 1 Sedlec 0.45 40 124 7.7 2 Cserszegtomaj 0.49 47 95 13.1 3 Királyhegy 0.35 21 300 7.6 4 Georgia 0.41 31 140 5.8 5 Keokuk 0.26 2 220 1.1 6 Klösterle 0.48 46 99 6.3 7 Sokolov 0.43 35 134 6.8 8 Vidnova 0.44 38 110 9.3 9 Rochlitz 0.43 36 110 3.6 10 Passau 0.59 67 89 7.2 11 Maria mine 1 0.33 17 155 8.8 12 Maria mine 2 0.35 20 167 7.3 13 Petrifalau 0.47 45 136 8.3 14 Sasca-Montana 0.48 46 94 5.9 15 Ladoga lake 0.34 18 173 8.3 16 Kovaso 1 0.42 34 137 7.3 17 Kovaso 2 0.46 53 111 4.7 Bj(ooi): angular width at half maximum, CCI: complex crystallinity index, D(ooi>: coherently scattering domain size in the (001) direction, ^(e 2 ) X10 3 : crystal lattice distortion in the (001) direction. Sokolov belong to group B instead of BA, due to the smaller amount of kaolinite in the sample, since the thermal parameters reflecting the order in kaolinites depend on concentration (and particle size) as well. When calculating the degree of order, allowance was made for errors by correcting the peak heights according to the concentration of kaolinite in the sample. The kaolinites belonging to groups AB and BA have degrees of order higher than 65, which is close to SMYKATZ-KLOSS' (1975) limit value for well-ordered kaolinites. It should be borne in mind, however, that both sequences are relative, and are compared to two different reference materials. The selected reference materials show a good distribution, the hydrothermal kaolinite from Keokuk is the most ordered, the sedimentary one from Cserszegtomaj is the least one, while the kaolinites from Királyhegy (hydrothermal) and Georgia, Sedlec (sedimentary) are roughly in the middle of the sample series investigated, affording a good possibility for comparison along the full scale. A comparison of the degree of order (DO) values based on the measurement of thermal parameters with the CCI values calculated from X-ray diffract ograms reveals that with the exception of a few samples the kaolinites falling into the range of DO = 65-100 correspond to the well-ordered kaolinites (between 0 and 40), while those with DO = 32-65 to the range of 40-70 CCI, corresponding to the medium ordered kaolinites. Consequently, the kaolinites belonging to groups AB and BA are considered to be well-ordered, those in group B are ordered and the members of group BC are disordered. Evaluating the relationships of the CCI and DO values of the reference kaolinites {from Georgia, Keokuk, and Sedlec) definite trend could be recognized (Fig. 1). The values of the other samples were along this line with various deviations. These differences are probably due to the following facts:
