of the Paris Exposition. 197 
was sent from the Kirghise Steppes, Siberia. A small fragment 
of native silver, joined perfectly to the copper, as in the Lake 
Superior specimens, was observed in this specimen by Mr. Des- 
Cloizeaux, 
Native silver.—tThe collection from the Kongsberg mines of 
Norway contained some extraordinary crystallizations of silver, 
“Among these may be noted a cubic crystal three-quarters of 
an inch in diameter, with truncated angles; and a group of 
modified cubes, twenty or thirty in number, forming a mass 
about three inches in diameter. There were also some fine 
crystals of sulphuret of silver, and crystals of calcite penetrated 
with wire silver, 
Proustite.— Some large groups of choice crystals of this 
species were in the collection from the mines of Cha arcillo, 
Chili, but the most extraordinary exhibition of this mineral 
species, in a massive form, was in the United States section, from 
the Poorman lode, Idaho Territory. The greater part of one 
of the masses weighing about 200 Ibs. was composed of this 
mineral, 
Torcornalite—Among the silver ores sent from Chili, Mr. 
Domeyko notes a new species to which he has given this name; 
a double iodid of silver and of mercury, from the Alfinhallada 
mine, Tres Puntas. 
Cryolite—A mass of this mineral, three feet long and two 
feet thick, from Iviktout, Greenland, was exhibited by the 
Greenland Cryolite Mining Company. Nearly 20,000 tons of 
this mineral were shipped in 1866. 
Allanite.—In large crystals from Avegeit, Greenland. 
Iceland spar—F¥rom Helgostad, Iceland. The end of a 
large crystal 24 feet long and two feet in diameter at the base. 
One of the faces was studded with small implanted crystals of 
stilbite. The mass appears to be quite sound and clear, and, 
With other fine cleavage masses, to be suitable for optical pur- 
poses % 
ten inches thick. A specimen from the Medno-R mine, 
