Mineralogy and Petrography. | 849 © 
gion. Baron von Foullon' separates the porphyrites of the Tyrol 
_ into quartz-porphyrites, quartz-mica-porphyrites, and diabase- 
i i In connection with the first group, Von Foullon 
o 
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4 Various localities in the Alps. A staurolite-mica-schist occurs 
nth It contains numerous hemimorphic crystals of 
A garnet amphibolite is remarkable for the occur- 
rei € second, in which uralite and a little augite 
+ Sg instead of hornblende, the plagioclase is sausuritized. A 
4 Variety contains brown garnets in oscillatory combinations of 
: dron and the icositetrahedron. They are the oldest 
Of the pitchstone-porphyry the author says, this 
d schist. It contains nearly five per cent. of rutile and 
€ rocks of the Hereroland in Southwest Africa 
y to the class of the older eruptives.* The quartz 
me of the granites contain fluid inclusions with hexa- ` 
7) pleochroic = hofe.” ‘Orthoclase and microcline are 
‘In the manner described by Becke.s The former has 2 oe 
* Jahrb. d. k k : l % ; T mie PA ee 
- K. k. geol. Reichsaust, 1886, p. 747. 
Toig Jahrb. f. Min., etc., 1887, i. p. 147 Bae 
“HY u. Petrog. Mitth., viii., 1887, p. 331- aA 
iz Wulf, Min. u. Petrog. Mitth., viii., 1887, p. 193. 
&: Min. u, Petrog. Mitth., iv., Taf. ii Fig. & - 
