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. Chemical analyses of amphiboles 1. 2. 3. 4. 5. 6. Si0

2 42.4 43.4 42.2 43.3 42.9 42.6 A1

2

0

3 12.7 12.3 12.8 12.3 12.5 12.5 Ti0

2 1.90 1.73 2.20 1.63 1.82 1.75 Cr

2

0

3 0.11 0.04 0.08 0.10 0.04 0.07 FeO 10.9 9.6 11.4 9.4 10.9 9.4 MnO 0.15 0.06 0.10 0.09 0.15 0.08 MgO 14.6 15.6 14.3 16.4 14.9 15.8 CaO 11.4 11.4 11.9 11.8 11.6 11.8 Na

2

0 2.33 2.36 2.23 2.29 2.28 2.11 K

z

O 0.51 0.52 0.46 0.59 0.51 0.61 NiO 0.01 0.00 0 07 0.06 0.00 0.02 Total : 97.01 97.01 97.74 97.96 97.60 96.74 Si 6.249 6.343 6.197 6.280 6.281 6.257 A1

IV 1.751 1.657 1.803 1.720 1.719 1.743 A1

VI 0.455 0.462 0.413 0.383 0.438 0.421 Ti 0.211 0.188 0.243 0.178 0.200 0.194 Cr 0.012 0.005 0.010 0.011 0.005 0.008 Fe 1.344 1.174 1.400 1.140 1.335 1.155 Mg 3.207 3.398 3.130 3.545 3.250 3.459 Ca 1.801 1.785 1.873 1.833 1.820 1.857 Na 0.666 0.669 0.635 0.644 0.647 0.601 K 0.096 0.097 0.090 0.109 0.095 0.114 Ni 0.001 0.000 0.009 0.007 0.000 0.002 mg 70.5 74.3 69.1 75.7 70.9 75.0 Analyses No. 1-2: traverse Gv-3/A border zone; No. 3-8; Gv-3/ß border zone and core; No. 9-14: Gv-3/C rim and core; No. 15-27: Gv-l/A rim and core; No. 28: separated grains. FeO signifies total Fe if Fe

2

0

3 is not given.