154 FIELD COLUMBIAN MusEUM—GEOLOGY, VOL. I. 
a granular quartz gangue with numerous cavities which contain wire 
silver. 
‘6257, [E 1112.] Galena and blende with wire silver, scheiderz 
from the Loaizita lode, Echandia mines,”’ Like No. 256. 
‘¢258. Pyrite, galena and blende, ore from the San Antonio 
vein, Echandia mines.” 
“259 [E 1113.] Pyrite, schecderz from the San Antonio vein, 
Echandia mines.” 
This is a cellular aggregate of pyrite crystals. 
“260. [E 1114.] Pyrite and galena, schetderz from the San 
Antonio vein, Echandia mines.” 
The gangue is quartz. 
(261. [E 1115.] Pyrite and blende in quartz, orefrom the San 
Antonio vein, Echandifa mines.” 
It contains wire silver in cavities. 
“262. [E 1116.] Galena and pyrite, with native silver and 
argentite, ore from the Loaizita lode, Echandia mines.” 
The native silver occurs abundantly, both encrusting the sul- 
phides and as wire silver. 
*©263. [E 1117.] Schecderz from the Loaizita fae Echandia 
mines.” 
This consists of blende, pyrite and galena with native silver in 
quartz. 
‘©264. [E 1142.] Quartz with native silver and argentite from 
the Loaizita lode, Echandia mines.” 
‘¢265. [E 1118.] Galena, pyrite and blende in quartz, ordinary 
ore from La Plata vein, Echandfa mines.” 
This specimen consists of granular sulphides in granular quartz 
and decomposed rhyolite. 
“266. Quartz, ordinary ore from La Plata vein, Echandfa 
mines.” | 
207, el 27 Ox, if Pe cune and blende, sche:derz from La Plata 
vein, Echandfa mines. 
The gangue is a mixture of quartz grains, with decomposed 
rhyolite. 
Argentite is present in the form of small grains. 
‘¢268, Pyrite and blende, schezderz from La Plata vein, Echan- 
dia mines.” 
‘©269. Galena, scheiderz from La Plata vein, Echandfa mines.” 
‘¢270. Galena, scheiderz from La Plata vein, Echandia mines.” 
From the gold mines of Marmato, Sefior Gamba collected the 
following six specimens, representing three mines: % 
