Vol. 6] 



Eakle: Neocolemanite. 



189 



Associated calcitc. — Specimens containing veins of crystal- 

 lized calcite were recently collected from the main shaft by R. 

 M. Wilke and kindly sent me. The mineral is both yellow and 

 colorless, and the crystals exhibit three types of combinations. 

 Most of the crystals are slender prisms terminated by rhom- 

 bohedral faces. One type consists simply of the prism (10T0) 

 and striated faces of the low rhombohedron (0112). A second 

 type shows the prism capped by large striated faces of the steep 

 negative rhombohedron (0995), narrow faces of (0112), very 

 narrow faces of the unit rhombohedron (10T1), and a small 

 triangular base (0001). The third type shows the prism capped 

 by perfect faces of the unit rhombohedron (10T1) and striated 

 faces of the negative rhombohedron (0221), the two being in 

 about equal development. 



Mineralogical Laboratory, 



University of California. 



Transmitted March 9, 1911. 



