Acanthite, a silver sulfide mineral, was reported from Franklin by Hendricks (1960) and subsequently reported from there and Sterling Hill by Frondel (1972). Acanthite is dull black and sectile. Few specimens exist, and none have been studied in detail. Hendricks (1960) and [Dunn] have found acanthite as a component of thin silver films associated with chalcocite and magnetite from Franklin. Energy-dispersive X-ray analysis showed the presence of major Ag and S. Some specimens may have been labeled argentite. (Dunn, 1995)

 Location Found: Franklin and Ogdensburg
 Year Discovered: 1885
 Formula: Ag2S
 Essential Elements: Silver, Sulfur
 All Elements in Formula: Silver, 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   Acanthite

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.526

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