In black schist that replaced rocks in the region.
Quality of samples:
not specified / average specimens
Confirmation
Validity:
Believed Valid
References
References:
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 170; Anderson, C.A. & S.C. Creasy (1958), Geology and ore deposits of the Jerome area, Yavapai Co., AZ, USGS PP 308; Lindgren, W. (1926), USGS Bull. 782: 61-78.