Kittatinnyite is a calcium manganese silicate hydroxide hydrate mineral. Assumptions about the oxidation state of the cations are given by Dunn and Peacor (1983a). The formula is tentative and calculated in part based on the analogy to the isostructural wallkilldellite. This relation to wallkilldellite is the first known natural example of As/Si analogues in layer structures.
Kittatinnyite was described from Franklin by Dunn and Peacor (1983a). It was originally found in 1874 in the Taylor Mine, which became part of the Franklin Mine. It has not been reported from Sterling Hill. The crystal structure is unknown.
Kittatinnyite occurs as sparse, composite, subparallel aggregates up to 0.5 mm in diameter; individual crystals are flattened and very thin. Kittatinnyite is bright golden yellow, resembling specks of native gold in hand-specimen. The luster is vitreous; the density is 2.61 g/cm3; and the mineral is brittle. There is no discernible fluorescence in ultraviolet.
Kittatinnyite is known only on one specimen from Franklin. It is found on the type specimen for bostwickite on medium-grade ore consisting of franklinite, calcite, and fluorite. Bostwickite is on one side of the specimen; kittatinnyite is on the other. Kittatinnyite is a very rare mineral. (Dunn, 1995)

 Location Found: Franklin (Type Locality), unique to Franklin/Ogdensburg area
 Year Discovered: 1983
 Formula: Ca2Mn2Mn(SiO4)2(OH)4 · 9H2O
 Essential Elements: Calcium, Hydrogen, Manganese, Oxygen, Silicon
 All Elements in Formula: Calcium, Hydrogen, Manganese, Oxygen, Silicon
 IMA Status: Approved
 To find out more about this mineral at minDat's website, follow this link   Kittatinnyite

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.497

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 25 No. 1 - Spring 1984, pg. 7Mineral Notes Research Reports, Kittatinnyite
View IssueV. 24 No. 2 - Fall 1983, pg. 8Mineral Notes New To Science, Kittatinnyite

Kittatinnyite, fluorite, franklinite and calcite from Franklin, NJ
Kittatinnyite (golden tan), fluorite (reddish brown), franklinite (black) and calcite (white) from Franklin, NJ. Field of view 1/2" x 1/4". From the collection of, and photo by Robert A. Boymistruk.

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