349 
close affinity with the rhyolite of Etsenpacn near Vichaye ‘) in 
Hungary. 
According to the method of W. Cross, J. P. Ippings, L. V. Pirsson 
and H. S. Wasnineton’*) the calculation of the mineralogical com- 
position gave the following result: 
__sio2 Tio? | Al203 |Fe203) FeO | MgO | K20 |Na20 
| | | 
Orthoclase 38.88 — | 11.02 — — == 10.17 |= 60.07 
Albite 0517 -- | 0.05  — = — 10.03 0.25 
Corundum -— ze ii 1400 — | — — = lh Gigi nd 
Ilmenite Se BIRO) eee OLS ee a tes 
Hematite — — GAT p= — = — | 6.47 
Hypersthene 1.68 — — — | 0.19 | 0.99 — — | 2.86 
Quartz 21.69 = = |= — — red 27.69 
1 68.42 | 0.70 | 12.72 | 6.47 | 0.50 | 0.99 | 10.17 0.03 | 100.00 
| | | 
salic : femic : 
Orthoclase 60.07 Ilemenite 1.01 
Albite 0.25 Hematite 6.47 
Corundum — 1.65 Hypersthene 2.86 
Quariz 27.69 
89.66 10.34 
To the rock in the chemical system consequently a place must 
be assigned in: 
Sel = 8966.2 7 
nn 
= Class I. Persalane. 
Fem 10.34 1 
QEFL 7 
WPT UN = Subelass I. Persalone. 
G 2. € : 
= li < => : .. == Order 4. Britamare. 
EC 20 „O1 
eee Dee 4 = = -== Rang I. Liparose. 
ac race 
1) Not Vichnye, as J. Roru (Beiträge zur Petrographie der plutonischen 
Gesteine. Abhdlg. k. Akad. d. W. 1869. II. Berlin 1870, p. LX XXIII) and all 
those who copied him, communicate. 
2) Quantitative Classification of Igneous Rocks. Chicago 1903, p. 110 et seq. 
