Genthelvite from Cookstove Mountain, El Paso County, Colorado*

In February 1951 a small but highly modified crystal of genthelvite Zn₄Be₃Si₃O₁₂S, (Fig. 1) was found on a northeast-trending spur of Cookstove Mountain in the $NE14$$NW14$$NW14$sec. 4, T. 15 S., R. 67 W. (U. S. Geological Survey Manitou $712$-minute quadrangle), El Paso County, Colo. Another occurrence of genthelvite from El Paso County was recently reported (Glass and Adams, 1953), but because of the rarity of genthelvite, further discussion on the mode of occurrence and crystallography is thought to be warranted.