1922] A Magnetite-Marble Ore at Lansing, N. C. 151 



slight pleochroism in light yellow tones. These are arranged about 

 parallel to the contact plane. A few crystals of pyrite are the only 

 other components present except, of course, the predominant, com- 

 paratively large grains of carbonate, most of which are polysynthet- 

 ically twinned. The carbonate is free from inclusions except for tiny 

 particles of what appears to be pyrite dust, but between the grains 

 is often a stain of limonite. Immediately at the contact there had been 

 slight movement with the development of a thin layer of light colored 

 mica. 



At the contact with the pegmatite the contact zone is about 11/2 

 inches wide, and is composed of two layers, the inner one of which 

 is characterized by the presence of plates of tremolite and more scanty 

 plates of wollastonite scattered through the limestone, but mainly in 

 such a way as to constitute bands running parallel to the contact. 

 The tremolite is generally fresh and colorless but the wollastonite is 

 traversed by many cracks in which have been deposited fibers of a 

 light green micaceous mineral, with a slight pleochroism in greenish 

 and yellowish tones. Occasional tremolite flakes are tinged with green. 

 These are very slightly pleochroie, thus approaching actinolite in char- 

 acter. The outer zone next to the pegmatite consists exclusively of 

 a light-gray platy tremolite arranged with its long directions perpen- 

 dicular to the contact. The tremolite strongly resembles the mineral 

 at the Lansing Mine that has been called actinolite. Whether the two 

 minerals are actually the same or are different is of little importance. 

 Their presence indicates that the pegmatite added material to the 

 limestone in both cases. The irregular distribution of the limestone, 

 parts being almost completely surrounded by silicate rocks, suggests 

 an explanation of the irregular distribution of the ore at Lansing. 

 The limestone bed was broken into fragments as at the occurrence on 

 the railroad and the limestone ore naturally possesses a similar dis- 

 tribution. 



Reserves : — Because of the irregular manner of distribution of the 

 limestone in the schists at the Lansing locality and the small amount 

 of prospecting that has been done in the mine, it is impossible to esti- 

 mate with any probability of correctness the quantity of ore that may 

 be expected. If the limestone is shattered as it is near Toecane it may 

 terminate within a few feet of the present workings, or it may extend 

 beyond them for a long distance. In either event it is probable that 



