Ferroactinolite (Ferro-actinolite), a calcium iron silicate hydroxide mineral of the amphibole group, has been found and analyzed on only one specimen from Franklin, in which green massive ferroactinolite is associated with epidote. Nothing is known of its occurrence; given the low Zn content, it might be from Balls Hill where similar, but unstudied specimens have been found.
Ferroactinolite was reported from Sterling Hill by Reilly (1983). It was found in drill-hole #124, 119 feet from its origin on the 340 level, associated with calcite, franklinite, hedenbergite, and andradite. Three microprobe analyses were provided, the most iron-rich of which yielded SiO2 50.62, Al2O3 0.55, CaO 10.99, FeO 26.64, MnO 0.41, MgO 4.30, K2O 0.30, ZnO 4.09, total = 97.9 wt. %.(Dunn, 1995)

 Location Found: Franklin
 Formula: ☐{Ca2}{Fe52+}(Si8O22)(OH)2
 Essential Elements: Calcium, Hydrogen, Iron, Oxygen, Silicon
 All Elements in Formula: Calcium, Hydrogen, Iron, Oxygen, Silicon
 IMA Status: Approved
 To find out more about this mineral at minDat's website, follow this link   Ferro-actinolite

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.454. 'Ferroactinolite'

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