Descriptive Catalogue of Rocks and Minerals. 261 



stone usually exhibits some shade of bluish white, (No. 51.) 

 it is sometimes mixed with magnetic pyrites (56); and is 

 frequently traversed by veins of calcareous spar containing 

 fibrous actynolite.(56) 



26, 27, 28, and 29. Chalcedony, Jasper, Agate, Red Jas- 

 per, and Yellozo Jasper, of Stokes. These siliceous miner- 

 als, including No. 79, and numerous varieties of the same, 

 are found in one field, scattered over the surface of the 

 ground. Pieces of coarse chalcedony, five inches in diam- 

 eter, were among the number. 



30 — 44. Varieties of Quartz, intended to illustrate the 

 following remarks. — A singular deposit of quartz is scatter- 

 ed over this region, covering a tract of country in a nar- 

 row band from N. E. to S. W. not less than 50 miles long, 

 passing through the counties of Granville, Orange, and 

 Chatham, and embracing almost every variety of this min- 

 eral mentioned in mineralogical works. Indeed, nearly all 

 those in this collection were obtained in one field, six miles 

 west of this village. Besides several other foreign sub- 

 stances, incrusting or penetrating the quartz, fragments 

 similar to No. 41, associated with a large proportion of 

 sp^cylar oxide of iron, form a pretty regular line from 

 Hillsborough southward into the county of Chatham, more 

 than twenty miles. 



45. Mica Slate, from the Saura Town mountains, in 

 Stokes. At the base of the mountain are found heaps of 

 yellow micaceous sand, resembling pyrites, and often delud- 

 ing the inhabitants with an impression that in contains 

 gold. 



46. i Tortuous Mica Slate, from the western part of S. 

 Caijolina. 



47 — 49. Petrified Woo '^ — No. 47, is from Fayetteville; 

 48 from the banks of the Neuse in Wayne Co.; and 49 from 

 the vicinity of this village. In each of these places, it oc- 

 curs in very numerous fragments, usually scattered over 

 sandy plains. It is highly siliceous, and frequently exhibits 

 veins of chalcedony. No. 49 is found over red sandstone. 

 The banks of the Neuse in many parts of its course are 

 strewed with pieces like No. 48. 



50. Acty7iolite, associated with calcareous spar, which 

 traverses the Stokes limestone in veins. 

 ' 51. Blue Limestone, of Stokes. 



Vofc. v.— No. 2. 34 



