Skutterudite, a cobalt arsenide mineral, was first verified from Franklin by Holmes (1945, 1947). The drawings of isometric crystals by Koenig (1890) and Palache (1935) are possibly of skutterudite. Oen et al. (1984) reported skutterudite as modified euhedral crystals isolated from the other arsenides in the calcite and fluorite gangue. Some such crystals have cores of highly twinned rammelsbergite. Skutterudite is among the rarest of the Franklin arsenides and is not known from Sterling Hill. (Dunn, 1995)

 Location Found: Franklin
 Year Discovered: 1845
 Formula: CoAs3-x
 Essential Elements: Arsenic, Cobalt
 All Elements in Formula: Arsenic, Cobalt
 IMA Status: Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
 To find out more about this mineral at minDat's website, follow this link   Skutterudite

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.553

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.76

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 31, No. 1 - Spring 1990, pg. 3Breithauptite From The Nickel-Arsenide Assemblage at Franklin, New Jersey, Skutterudite (small description)
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