Neotocite is a manganese silicate hydrate mineral. Only Sterling Hill neotocite has been analyzed yielding: SiO2 39.5, FeO 0.3, MgO 6.4, CaO 0.4, ZnO 0.6, MnO 37.2, As2O5 1.0, with water by difference 14.6, total = 100.0 wt. %. Sterling Hill material contains no appreciable carbonate, as evidenced by a lack of effervescence in 1:1 HC1.
Neotocite was reported from Franklin by Palache (1935), but has not been studied since. It is found at both deposits.
Neotocite is apparently black, but is dark brown, with vitreous to resinous luster, no cleavage, and a hardness of 4 or less. It is very brittle and has a conchoidal fracture. The index of refraction is 1.57. It is easily identified by its luster, color, and brittleness.
Little is known of the occurrence of local neotocite. A studied Sterling Hill specimen consists of neotocite fracture-fillings in calcite. Palache (1935) reported neotocite in the marble from the Trotter Mine and also noted a neotocite associated with esperite. Hydrocarbons may be present. Unstudied neotocites are commonly associated with serpentine, rhodochrosite, and calcite; rhodonite may be the sole associated mineral. (Dunn, 1995)

 Location Found: Franklin and Ogdensburg
 Year Discovered: 1848
 Formula: (Mn,Fe,Mg)SiO3 · H2O
 Essential Elements: Hydrogen, Manganese, Oxygen, Silicon
 All Elements in Formula: Hydrogen, Iron, Magnesium, Manganese, Oxygen, Silicon
 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   Neotocite

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.516

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. 15, No. 1 - February 1974, pg. 9Mineral Notes - Neotocite
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