Goldschmidt and Parsons — Notes on Goethite. 235 



Art. XYIII. — Notes on Goethite* (Abstract) ; by Y. Gold- 

 schmidt (Heidelberg) and A. L. Parsons (Toronto). 



Ix the summer of 1908 Mr. Parsons collected some speci- 

 mens of goethite which occurs in veins in carboniferous shale 

 at Walton, JS". S. The veins are brecciated and the center 

 tilled with calcite. When the calcite was dissolved in hydro- 

 chloric acid the goethite was left as a druse of bright crystals. 



Fig. 2. 



Three crystals were measured. The observed forms are : 

 & = 0oo(010); M = 2 a>(210); a = a>0(100); y = oo (110) ; 

 XX = x4 (140) ; e = 01 (Oil) ; u = 10 (101) yp = 1 (111) ; p =~- 

 31(311). The form designated as XX appears in all the crys- 

 tals as the face with the greatest development. This face is 

 striated lengthwise and is not a single face but a transition 



* Abstract of a paper in Grotb's Zeitschrift fur Krystallographie. 



