Genth.] dOO j^Sep. 19i 



I am indebted to Rev. C. D. Smith. He states that soapstone appears to 

 be the leading rock. Amongst the specimens were several which appeared 

 to be talc slates of a pale greenish-white color, but, which by an analysis 

 of Dr. Geo. A. Koenig, were proved to be a true chlorite slate. He 

 found : 



SiO, = 30.33 



Al,6 3 = 20.90 



Fe A = 4.00 



FeO = 4.11 



MgO = 27.79 



Ignition = 12. 63 



99.75 



The corundum occurs as a nucleus in irregular kidney-shaped masses 

 of margarite, or with a peculiar earthy mineral of a color between isabel 

 and flesh-red, and frequently intersected by veins of a fine scaly or 

 massive margarite. I shall give the analyses of both in the mineralogi- 

 cal part of this paper. There are found at the same locality dark green 

 foliated chlorite, actinolite, asbestus and tourmaline. 



It remains to say a few words with reference to the occurrence of 

 corundum near Dudleyville, Alabama. For specimens from this locality 

 I am indebted to Rev. C. D. Smith, of Franklin, North Carolina, and to 

 Prof. Eugene A. Smitb, of Tuscaloosa, Alabama. From these it is evi- 

 dent that the deposit is a repetition of those already discussed ; chryso- 

 lite rocks to a great extent changed into serpentine and even talc, with 

 asbestus, chlorite and tourmaline ; the corundum is associated with 

 spinel, margarite and dudleyite, a mineral resulting from the alteration 

 of the latter. 



Very similar to these occurrences of corundum in our great chromifer- 

 ous serpentine region are those in the Ural, described by G. Rose.* At 

 Mramorsk, ou the west side of a marble quarry is one of leekgreen ser- 

 pentine, and at another quarry a greenish-black chlorite schist with fine 

 grained emery intermixed. The chlorite schist contains little veins or 

 patches filled with a rose-red or reddish-brown mineral, foliated chlorite, 

 a white micaceous mineral and yellowish-gray granular zoisite. Some of 

 the veins contain diaspore and chloritoid. The marble quarry at Kassoi- 

 brod has on its western side chloritic schist ; on the eastern side granite. 

 In the chlorite schist was found a crystal of blue corundum, a six-sided 

 prism with basal plane on which was observed white star-like opalescence. 

 Generally there is very little corundum present ; the associations of 

 which are tourmaline, chlorite, etc. 



J. L. Smith,! in his very important paper on emery, relates the occur- 

 rences of emery, corundum and associated minerals in Asia Minor and 

 the Grecian Archipelago. According to his observations the emery is 

 *G. Rose Keise nach dem Ural, etc., 151,248,256. 

 t J. L. Smith-Sill. Jeurn. [2] X, 355 ff. and XI, 53 ff. 



