Nontronite, a sodium ferric-iron silicate hydroxide hydrate mineral of the clay group, was reported by Frondel (1972) as dull greenish masses from the mud zone at Sterling Hill in 1962. The first verification was by J. L. Rodda of the New Jersey Zinc Company. [Dunn] has obtained an X-ray powder diffraction pattern of nontronite from some yellowish-green clay coatings associated with altered tephroite on Sterling Hill specimens. Nontronite has not been studied further, and it remains a minor mineral. It has not been reported from Franklin. (Dunn, 1995)

 Location Found: Ogdensburg
 Year Discovered: 1827
 Formula: Na0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
 Essential Elements: Hydrogen, Iron, Oxygen, Silicon, Sodium
 All Elements in Formula: Aluminum, Hydrogen, Iron, Oxygen, Silicon, Sodium
 IMA Status: Approved
 To find out more about this mineral at minDat's website, follow this link   Nontronite

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.486

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.70

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 3, No. 2 - July 1962, pg. 10Nontronite - variety of Chloropal (small article)

Nontronite, calcite from Sterling Hill Mine, Ogdensburg, NJ
Nontronite (dark green-gray), calcite (white) from Sterling Hill Mine, Ogdensburg, NJ. Field of view 3/8" (9.5 mm). From the collection of, and photo by WP.

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