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 NE14NW14NW14sec. 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.

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