Qenth.] 



84 



[Feb. 6, 



INVESTIGATION OF IRON ORES AND LIMESTONES FROM 

 MESSRS. LYON, SHORE & GO'S IRON ORE BANKS ON SPRUCE 

 CREEK, HALF MOON RUN AND WARRIOR'S MARK RUN, IN 

 CENTRE, BLAIR AND HUNTINGDON COUNTIES, PA. 



By F. a. Genth. 



{Read before the American Philosophical Society, February Qth, 1874.) 



NO. 1. EAST PENNINGTON BANK. 



The greater portion of thirteen specimens, received for examination, 

 was compact, dull, of various shades of brown and had liket^To. 1 an ad- 

 mixture of dark brown pitchy ore ; other portions were porous and had 

 the cavities lined with botryoidal fibrous brown limonite, others were 

 stalactitic. Some of the ore had lost a part of its water of hydration 

 and had changed into turgite and even into hematite. Many of the 

 pieces showed a considerable admixture of manganese minerals, such as 

 wad, minute quantities of pyrolusite and perhaps psilomelane, some con- 

 tained a large quantity of rounded grains of quartz. 



An average of the whole showed the following composition : 



100.00 



100 Iron and Manganese contain 0.197 Phosphorus. 



NO. 2. WEST PENNINGTON BANK. 



Five specimens were submitted for examination. The ore was mostly 

 of various shades of yellowish brown to dai'k hair-brown and without 

 lustre ; in some was an admixture of a dark blackish brown ore with sub- 

 conchoidal fracture and a resinous lustre ; some portions had a slight 

 waxy lustre, others were earthy and dull. It was amorphous, but in 

 places the cavities were lined with a coating of brown fibrous limonite. 

 On being breathed upon, it developed a strong argillaceous odor. 



