Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 63. (Budapest 1971)

Embey-Isztin, A.: Contribution to the mineralogy of the bauxites from Nézsa (North-Hungary)

ANNALES HISTORTCO-NATURALES MUSEI NATIONALIS HUNGARICI Tomus 63. PARS MINERALOGICA ET PALAEONTOLOGICA 1971 Contribution to the Mineralogy oí the Bauxites from Nézsa (North-Hungary) By A. EMBEY-ISZTTN, Budapest Geology The village Nézsa is situated northeast of Vác in the so-called "Fault Blocks Left of the Danube". There is a small lenticular bauxite deposit along a NW

—

SE striking fault at the foot of the Szelehegy at Nézsa. The first description of the bauxites of Nézsa was published by L. LÓCZY and P. ROZLOZSNIK (1935). Table 1. X-Kiiy Diffraction Data for Bauxite from j\ézsa Ni-Filtcred Copper Ka Radiation Yellow bauxite Red bauxite d(A) I Mineral d(A) I Mineral 7.16 50 Kaolinite 7.14 7 Kaolinite 4.95 4 Goethite 4.70 7 Diaspore 4.71 7 Diaspore 3.98 100 Diaspore 4.45 17 Kaolinite 3.67 6 Hematite 4.35 18 Kaolinite 3.56 5 Kaolinite 4.17 34 Goethite, Kaolinite 3.52 6 Anatase 3.99 100 Diaspore 3.22 9 Diaspore 3.83 7 Kaolinite 2.69 14 Hematite 3.56 42 Kaolinite 2.55 31 Diaspore 3.52 16 An atase 2.51 12 Hematite 3.38 5 Goethite, Kaolinite 2.38 6 Diaspore 3.24 2 Rutile 2.35 12 Diaspore 3.21 8 Diaspore 2.31 63 Diaspore 2.69 12 Goethite, Hematite 2.08 57 Diaspore 2.55 34 Diaspore, Kaolinite 1.84 3 Hematite 2.49 18 Kaolinite, Goethite 1.81 3 Diaspore 2.44 17 Goethite 1.71 14 Diaspore 2.38 10 Diaspore, Kaolinite 1.69 6 Hematite 2.35 20 Diaspore 1.63 47 Diaspore 2.31 58 Diaspore 1.48 25 Diaspore 2.29 12 Kaolinite 2.25 5 Goethite, Kaolinite