62 PROCEEDINGS OF THE ASSOCIATION OF 



low blende of Eaton, llie black blende of Shelburne, the reduced 

 metal from each, and from the associated lead ore. 



Prof. W. B. Rogers adverted to the occurrence of oxide of tin 

 in Virginia, associated with the auriferous quartz and other min- 

 erals of some of the gold mines. As yet he had discovered it at 

 only a few localities. It is in the form of very small crystals 

 scattered at wide intervals, and even where it occurs, is perhaps 

 the rarest of all the metallic minerals found in and contiguous to 

 the gold veins. Tn the two or three instances in which it was 

 found in place, it was imbedded in a talco-micaceous slate, near 

 its junction with the auriferous quartz. The minerals met with 

 in the talcose and micaceous slates, which usually include the 

 veins and beds of auriferous quartz, are auriferous, common, ar- 

 senical and cupreous sulphurcts of iron, sulphuret of copper, car- 

 bonate of copper, sulphuret of zinc, sulphuret of lead, sulphur in 

 minute crystals lining the cavities of cellular quartz, metallic gold, 

 peroxide of iron, phosphate of lead beautifully crystalline, oxide 

 of tin and oxide of bismuth, both exceedingly rare. 



In connection with Dr. C. T. Jackson's remarks on the occur- 

 rence of sulphuret and other ores of zinc in New Hampshire, 

 Prof. W. B. Rogers mentioned that he had found the sulphuret 

 of zinc sometimes, and the silicate (electric calamine) generally 

 and very abundantly in the lead mines of Wythe Co., Virginia. 

 The latter mineral often occupies a great part of the breadth of the 

 vein, lying for the most part beneath the lead ore, sometimes as a 

 sub-crystalline mass and sometimes in groups of small radiating 

 crystals. The sulphuret is chiefly met with in nests and thin veins, 

 in the sparry and magnesian limestone adjoining the lead ore, and 

 is intermixed with crystals and small seams of galena. 



Prof. Rogers added, as a fact of mineralogical interest, that 

 besides the sulphuret of lead, these mines yield in some instances 

 quite a large proportion of carbonate, of which beautifully pure 

 crystalline specimens are by no means uncommon ; and what is 

 still more interesting, they furnish a very considerable amount of 

 red oxide or native minium, with a small proportion oi yelloiv ox- 

 ide, both of which have hitherto been regarded as very rare min- 

 erals. From its resemblance to ferruginous earth or clay, this red 

 oxide v^^as until lately regarded at the mines as worthless, but is 

 now highly valued for its productiveness in metal. 



Dr. C. T. Jackson exhibited a specimen of meteoric iron from 

 Claiborne County, Alabama, in which he discovered clilorine, 

 in the form of chloride of iron and nickel, in 1834. 



Prof. J. B. Rogers referred to some analyses of meteorio iron 



