Pen field and Kr eider — Mineralogical Notes. 141 



locality is 507 feet. Wetumpka, Alabama, at 185 feet, and 

 Columbus, Mississippi, at 208 feet, represent the localities 

 which are nearest sea-level. The form found here is the same 

 as that of the Warrior river. The other form of Liojplax, — 

 L. subcarinata — has a much greater range being found at Fort 

 Snelling, in the Minnesota river, at an elevation of 722 feet, 

 and in the Raritan river, New Jersey where it occurs in a sta- 

 tion some 12 feet above tide water. 



The accompanying map is designed to present at a glance 

 the chief facts now known in the distribution of these forms. 

 Its drainage features are based upon those of the United 

 States Geological Survey Contour Map. In but a few cases 

 have the mnemonics been employed on the face of the map. 

 Their, introduction in. greater numbers would have obscured 

 the facts sought to be illustrated in the distribution. Extreme 

 localities for each form herein mentioned have been given and 

 by an inspection of these and mentally connecting them the 

 areas of individual distribution for' the several species will be 

 approximately shown. 

 Louisville, Ky., 18th Dec, 1893. 



Aet. XVIII. — Mineralogical Notes ; by S. L. Penfield and 

 D. A. Kreidee. 



1. On the Identity of Hydrofranklinite and Ghalcophanite. 



The name hydrofranklinite was given by W. T. Rcepper* 

 to a supposed new hydrous oxide of iron, zinc and manganese, 

 from Sterling Hill, near Ogdensburg, N". J. The mineral is 

 described as crystallizing in small, brilliant, iron black octahe- 

 drons, with octahedral cleavage. The original chemical exami- 

 nation was never completed, and it seemed therefore desirable 

 to investigate the mineral, an excellent suite of specimens in 

 the Brush collection, which had been collected by Professor 

 Brush at the locality in 1875, being available. The mineral 

 occurs as a coating of minute crystals, the largest not over l mm 

 in greatest diameter, deposited upon a manganese ore, which 

 is possibly of the same composition as the crystals but not dis- 

 tinctly crystallized. As it was found to be practically impos- 

 sible to separate the pure crystals by hand picking, the method 

 suggested by Retgers,f of separating minerals of high specific 

 gravity by means of fused thallium-silver nitrate, was re- 

 sorted to, but a satisfactory separation could not be effected by 

 this means as much of the gangue was of about the same 



* Appendix III, 5th ed. Dana's Min., p. 61. Dana's Min., 6th ed., p. 259. 

 f Jahrb. f. Min., 1893, I, p. 90. 



