AJ' ALABAMA MICA DEPOSITS 77 



properly located. Proximity to old workings from which 

 good mica is understood to have been taken out, especially 

 in the old tunnel which has since caved in, led to these 

 attempted new developments. 



The E. i/ 2 of S. W. % of Section 4, Township 18 S., 

 Range 10 E. Practically in the centre of these two 40's, 

 an open cut about 10 feet deep exposed a pegmatite dyke 

 dipping S. E. under a quartz hanging wall, carrying inter- 

 bedded on and below it masses of A-form mica of large 

 size. Five feet of pegmatite below the quartz has been 

 cross cut, with the foot wall not yet reached. The form 

 of crystallization improves at the bottom of the stope 

 driven under the quartz, the A-form showing a marked 

 tendency toward alteration into sheet mica, some good 

 books being found in the upper contact. 



One-half mile due west of this pit, and about the center 

 of the W. Va of the S. W. 14 of the same section, a simi- 

 lar but larger old entry cut about 100 feet in length 

 develops closely parallel conditions, the pegmatite entered 

 carrying heavy quartz exposures on the hanging wall, 

 below which masses of A-form mica of very large sizes 

 are imbedded. Several smaller pits adjoining the cut 

 also contain mica exposures, but so covered up by the 

 milling in of the old slopes as to afford very little infor- 

 mation of value as to the deposit. 



All of the above described developments are as stated 

 located on the properties of the Consolidated Mica Com- 

 pany near Micaville. 



Competent expert tests were made by this company of 

 mica stock shipped from their mines to the South Bend 

 factory, to determine its commercial value as electric 

 mica. Through the courtesy of Mr. J. R. Garn, Treasur- 

 er, the following records of official dielectric tests made 

 on average samples of Micaville stock, drawn in the 

 rough, and not as customarily prepared for testing, 

 will still serve to show a very acceptable commercial 

 grade of electric mica. 



Report on electrostatic test of mica samples, submit- 

 ted by the Consolidated Mica Company. The samples 

 were split to suitable thickness and tested between ball 



