Domeykite, a copper arsenide mineral, was first described from Franklin by Burke and Dunn (1988), but it has not been reported from Sterling Hill. It occurs intimately associated with cuprostibite, copper, and lead within gray willemite. The assemblage is limited to areas in the willemite which have inclusions of Mg-silicates (diopside, serpentine, chlorite, and mica). Domeykite grains are irregular and interlocked with cuprostibite and copper; maximum grain size is 30 microns. Microprobe analysis yielded Cu 71.3, As 28.2, total 99.5 wt. %. (Dunn, 1995)

 Location Found: Franklin
 Year Discovered: 1845
 Formula: Cu3As
 Essential Elements: Arsenic, Copper
 All Elements in Formula: Arsenic, Copper
 IMA Status: Valid - first described prior to 1959 (pre-IMA) - "Grandfathered" 1845
 To find out more about this mineral at minDat's website, follow this link   Domeykite

Dunn, Pete J. (1995). Franklin and Sterling Hill New Jersey: the world's most magnificent mineral deposits. Franklin, NJ.: The Franklin-Ogdensburg Mineralogical Society. p.544

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 29, No. 2 - Fall 1988, pg. 12Mineral Notes Research Reports, Cuprostibite & Domeykite
View IssueV. 29 No. 1 - Spring 1988, pg. 7Notes from the Laboratory & Changes to the List of Species From Franklin and Sterling Hill, Pete J. Dunn, John L. Baum, Additions to the list, Domeykite
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