430 



BULLETIN 131, UNITED STATES NATIONAL MUSEUM 



A specimen from the Bulkley mine contains thin blades and 

 rosettes of rose-red erythrite in rusty schist. 



In ore from the Hawkeye claim erythrite forms a pink pulverulent 

 efflorescence and deep rose-red spherulites on cobaltite in quartz. 



Fine pink blades and rosettes occur-in quartzite from the Brooklyn 

 claim. A crystal from here which was measured is illustrated in two 

 positions in Figures 142 and 143. This is tabular to the 6(010) face 

 and shows a termination formed of both the negative pyramid 

 v(lll) and the positive pyramid jc(lii), the latter a new form. The 

 angles measured are as follows : 



142 143 



Figs. 141-143.— 141, Vivianite. Silver City district, Owyhee County. After Farrington and Til- 

 lotson. 142-143, Erythrite. Brooklyn claim, Blackbird district, Lemhi County. Same crys- 

 tal DRAWN IN TWO POSITIONS 



SHOSHONE COUNTY 



Erythrite has recently been identified optically and by qualitative 

 chemical tests in cavities in an ore containing a cobaltiferous gersdorf- 

 fite in specimens sent to the National Museum by Erwin Ploetzke 



