Natrolite, a sodium aluminum silicate hydrate mineral of the zeolite group, has been reported in veinlets from Franklin by Frondel (1972). Natrolite occurs on pink calcite, forming 2-5 mm spherulitic aggregates and radial sprays of crystals in the hedenbergite-bearing fluorapophyllite assemblage at Franklin. It is also known from Sterling Hill where a 2 cm radial hemispherical group was found on the 1100 level. (Dunn, 1995)

 Location Found: Ogdensburg
 Year Discovered: 1803
 Formula: Na2Al2Si3O10 · 2H2O
 Essential Elements: Aluminum, Hydrogen, Oxygen, Silicon, Sodium
 All Elements in Formula: Aluminum, Hydrogen, Oxygen, Silicon, Sodium
 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   Natrolite

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.514

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.69

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 30, No. 1 - Spring 1989, pg. 9The Epidote-Pyroxene-Fluorapophyllite Assemblage in the Franklin Mine at Franklin, New Jersey, Philip P. Betancourt, Natrolite (small description)
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