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 2. continuation 15. 16. 17. 18. 19. 20. SiOo 43.3 44.2 44.6 43.3 43.9 43.9 A1

2

0

3 13.0 12.3 12.7 12.7 12.9 13.0 Ti0

2 2.31 1.78 1.61 1.54 1.60 1.56 Cr

2

0

3 0.07 0.18 0.14 0.11 0.11 0.12 Fe

2

0

3 — — — — _ FeO 9.4 8.4 7.4 7.7 7.7 7.4 MnO 0.07 0.05 0.08 0.00 0.05 0.03 MgO 15.9 17.1 17.4 17.4 17.5 17.4 CaO 11.7 11.7 11.6 11.7 11.8 11.8 Na,0 2.48 2.51 2.34 2.32 2.39 2.43 K

2

Ö 0.49 0.60 0.73 0.72 0.70 0.72 NiO 0.00 0.00 0.03 0.00 0.05 0.03 H

2

0~ — — — — — — Total : 98.72 98.82 98.73 97.49 98.70 98.39 Si 6.223 6.316 6.341 6.259 6.265 6.275 A1

IV 1.777 1.684 1.659 1.941 1.735 1.725 A1

VI 0.425 0.338 0.469 0.423 0.435 0.466 Ti 0.250 0.192 0.172 0.168 0.171 0.168 Cr 0.008 0.020 0.015 0.012 0.012 0.013 Fe

3— — — —— — Fe

2

+ 1.130 1.004 0.880 0.930 0.919 0.884 Mg 3.406 3.642 3.708 3.748 3.722 3.707 Ca 1.802 1.791 1.767 1.812 1.804 1.807 Na 0.691 0.696 0.645 0.651 0.661 0.674 K 0.090 0.109 0.132 0.133 0.127 0.131 Ni 0.000 0.000 0.004 0.000 0.006 0.004 mg 75.1 78.4 80.8 80.1 80.2 80.7