Carrollite, a copper cobalt sulfide mineral, is extremely rare at Franklin and unknown from Sterling Hill. It was first found by Dr. E. A. J. Burke in 1983. At Franklin, carrollite occurs as microscopic crystals, intergrown with sphalerite, bornite, and chalcopyrite. (Dunn, 1995)

 Location Found: Franklin
 Mineral Note:
 Formula: Cu(Co,Ni)2S4
 Essential Elements: Cobalt, Copper, Sulfur
 All Elements in Formula: Cobalt, Copper, Nickel, Sulfur
 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   Carrollite

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.531

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