168 FIELD CoOLUMBIAN MusEUuM—GEOLOGY, VOL. I. 
sites. Granite and syenite appear to be old local names for dacite 
and andesite. 
From the Ibague district Sefior Gamba collected thirty-three 
specimens, representing seven mines. The series is as follows: 
‘¢389. Quartz and pyrites, ore from the Triumfo mine, near 
Ibague.” 
‘¢390. [E 1198.] Quartz and pyrites, scheiderz from the Tri- 
umfo mine, near Ibague.” | 
The quartz contains pyrite and blende in about equal quantities. 
“391. [E 1133.] Pyrites and galena, scheiderz from the Tri- 
umfo mine, near Ibague.”’ 
With the pyrite and galena which occur in quantity there is much 
blende. 
‘©3292. Hornblende schist, wall rock in the Floresta mine.”’ 
‘293. Granite from near the Floresta mine.” 
As elsewhere in this catalogue, granite is here probably a syno- 
nym for dacite. 
‘© 395. Black (negro-negro) schist from the Floresta mine.’’ 
‘¢ 396. Quartz, ore from the Floresta mine.”’ 
‘397. Quartz, ore from the Floresta mine.”’ 
‘¢ 398. Quartz, ore from the Floresta mine.” 
‘399. Quartz, ore from the Floresta mine.” 
‘“‘4oo. Quartz, ore from the Floresta mine.”’ 
‘‘4or1. Quartz, ore from the Floresta mine.” 
‘‘402, Quartz, ore from the Floresta mine.” 
‘¢403. Schist from the wall rock in the Gallo mine.”’ 
‘¢404. Quartz, ore from the Gallo mine.” 
‘405. [E 1135.] Quartz, ore from the Gallo mine,” 
“406. [E 1135.] Quartz, ore from the Gallo mine.” 
“‘4o7. Quartz, with gray copper (¢etrahedrite).”’ 
‘408. Quartz, ore from the San Cayetano mine.” 
‘¢4og. Quartz, ore from the San Cayetano mine.” 
‘‘aro. Quartz, ore from the San Cayetano mine.”’ 
‘carr. [E 1136.] Quartz and pyrite, ore from the San Caye- 
tano mine. 
‘412. Colorado ore from the San Cayetano mine.” 
‘413. Syenite from Ibague. 
As used here, ‘‘syenite”’ is probably synonymous with andesite. 
At Anaime, a town of which nothing could be learned, Sefior 
Gamba secured specimens from three silver mines. Thespecimens now 
in the collection are from a deposit of tetrahedrite and quartz in mica 
schist and andesite tuff, which the miners know as ‘‘syenite.’”’ From 
