Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 73. (Budapest 1981)

Embey-Isztin, A. ; Noske-Fazekas, G.: On the chemistry of the large phenocrysts in the tuff of Godóvár (Börzsöny Mts., Hungary)

Table 1. Chemical analyses of clinopyroxenes 1. 2. 3. 4. 5. 6. 7. Si0

2 52.8 53.1 50.9 51.5 51.4 51.7 54.3 A1

2

0

3 1.69 1.55 2 70 2.52 2.68 2.37 3.60 Ti0

2 0.29 0.28 0.45 0.44 0.45 0.45 0.54 Cr

2

Ö

3 0.00 0.01 0.03 0.00 0.00 0.02 0.09 FeO 10.2 8.9 8.2 8.1 8.6 8.2 5.5 MnO 0.49 0.43 0.21 0.27 0.28 0.33 0.07 MgO 14.9 15.9 15.4 15.3 15.2 15.3 15.4 CaO 17.8 19.4 20.1 20.1 20.1 20.2 21.7 Na„0 0.17 0.18 0.21 0.24 0.26 0.26 0.30 K

2

0 0.06 0.03 0.03 0.02 0.03 0.03 0.05 NiO 0.00 0.00 0.02 0.00 0.01 0.01 0.00 Total: 98.40 99.78 98.25 98.49 99.01 98.87 101.55 Si 1.987 1.968 1.920 1.936 1.926 1.937 1.950 Al" 0.013 0.032 0.080 0.064 0.074 0.063 0.050 Al" 0.062 0.036 0.040 0.047 0.044 0.042 0.102 Ti 0.008 0.008 0.013 0.012 0.013 0.013 0.014 Cr 0.000 0.000 0.001 0.000 0.000 0.001 0.002 Fe 0.321 0.276 0.259 0.254 0.269 0.257 0.165 Mg 0.835 0.878 0.866 0.857 0.849 0.854 0.824 Ca 0.718 0.770 0.812 0.809 0.807 0.811 0.835 Na 0.012 0.013 0.015 0.017 0.019 0.019 0.021 K 0.003 0.001 0.001 0.001 0.001 0.001 0.002 Ni 0.000 0.000 0.001 0.000 0.000 0.000 0.000 Atom % Mg 44.2 45.3 44.5 44.4 43.9 44.2 45.1 Fe 17.8 14.9 13.7 13.6 14.4 13.8 9.2 Ca 38.0 39.8 41.8 42.0 41.7 42.0 45.7 mg 71.3 75.2 76.5 76.5 75.3 76.1 83.1 Analyses No. 1-14: traverse Gv-2b corresponding to those of Figs. 2ab; No. 15-18: traverse Gv-3 border zone; No. 19-22: traverse Gv-3/b border zone; 23-24: the same but inner zone; 25-26; Gv-2b/A core; 27: separated pale green grains mainly from the inner zones; 28: separated green .grains mainly from the border zones. FeO signifies total Fe if Fe

2

0

3 is not given.