Miscellaneous Notices in Mineralogy, Geology ^ ^c. 245 



understand it continues to be discovered in increasing quan- 

 tities, and in a recent letter from Shawnee Town, we are 

 informed that it has been found in loose mass&s as large 

 as twenty-four pound shot ; they are of a fine violet colour 

 and the surface is covered completely with cubical crystals ; 

 they have every appearance of having been formed in beds 

 of clay. 



25. Manganese and Sulphat of Lime in Virginia. 



In a letter from the late Rich. P. Barton, Esq. we are in- 

 formed that the manganese mentioned by Dr. Barton (Bruce's 

 Journal, Vol. I. p. 80,) is found in considerable quantities 

 ten or twelve miles east of the locality of the fluor spar, but 

 not in the same mountain. 



Very lately also, plaster of paris has been discovered in 

 Jefferson county at the foot of the Blue Ridge, and near 

 Shanandoah river, twenty-five miles north east from Win- 

 chester. I believe, adds Mr. Barton, that in no other in- 

 stance has sulphat of lime been found on the east side of 

 the Alleghany mountains in Virginia. On the west side much 

 has been found, on the Holston and on the Kenawa. 



26. Mum-stone and other minerals in Ohio, with remarks 

 on vegetable remains. 



Extracts of letters from Caleb Atwater, Esq. of Circleville. 



Speaking of the slate rocks of Zanesville, Ohio, of which 

 som€ account was published (page five) in this volume, Mr. 

 Atwater remarks : 



Alum-stone is frequently found one two and three feet in 

 thickness, remarkably rich. Immediately aboVe the shale, 

 1 have found it in such situations in great abundance and in 

 many places. 



The flint beds of Ohio, are somewhat different from 

 those of England, and I intend to point out that difference 

 at some future day, and also to send you a complete set of 

 specimens from our flint beds. Copper, I suspect, fre- 

 quently occurs in our flint beds ; I must collect what I deem 

 to be such. The green carbonate of copper is said to oc- 

 cur in great abundance in the flint beds of Athens county, 

 about sixty miles from this place. , 



