19^2] A Magnetite-Marble Ore at Lansing, N. C. 149 



the constituents of the limestone. That the aetinolite is in more or 

 less distinct lawyers may well be due to the presence of argillaceous lay- 

 ers in the original limestone. The production of the aetinolite in part 

 at least seems to have been subsequent to the deposition of the mag- 

 netite, but that its production was promoted by pegmatite solutions 

 seems to admit of little doubt. The distribution of the components of 

 the ore is such as would occur if they were produced by pneumato- 

 thermal contact action, emanating from dikes of pegmatite. No dis- 

 tinct dikes of pegmatite are to be seen cutting the limestone ores, but 

 they are believed to be represented by the small veins of quartz and 

 epidote that traverse it, by the aggregates of epidote and magnetite 

 and those of hornblende and magnetite that appear as streaks in it 

 and by the lenses of dark hornblende that occur here and there. The 

 epidote is believed to represent the feldspar of the pegmatites. All 

 gradations between pegmatites in which the feldspar is only slightly 

 epidotized and those in which all the feldspar has been replaced by 

 epidote are common in the Cranberry area. At Lansing very little 

 of the pegmatite magma reached the position of that portion of the ore 

 body now being worked, but the gases and liquids travelled along the 

 contacts between the limestone and the gneiss, penetrated the lime- 

 stone near the contacts and caused the deposition of magnetite and 

 the production of garnet which have been described as forming a sel- 

 vage on the borders of the ore body. 



Siniilar Ores Elsewhere : — The only other point in the state at which 

 similar magnetite-marble ore is known to exist is a few yards north 

 of Dr. Jones's residence, about a third of a mile northeast of the rail- 

 road station at Lansing and three-quarters of a mile north of Capt. 

 Cooke's mine. Here a hole was put down at a place where there was 

 much magnetite in the soil. At the depth of 25 feet a big piece of 

 limestone was encountered in the midst of the gneisses, with man- 

 ganese ore on opposite sides. The hole is now filled but on the old 

 dump, w^hich has almost entirely disappeared, a fragment of antinolitic 

 rock was found that is unquestionably a metamorphosed limestone 

 consisting of calcite, aetinolite and tremolite. 



Since returning from the field the study of the specimens collected 

 suggests that possibly the Red Rock ]\Iine about 11/2 miles southeast 

 of Shell Creek in Carter County, Tenn., and one mile from the North 

 Carolina State line is another similar deposit, but information of the 



