Feitknechtite, a manganese oxide hydroxide mineral, is rare at Franklin. It was first described as part of a mixture called hydrohausmannite by Frondel (1953) and was further discussed by Wadsley (1955b). The X-ray data for hydrohausmannite were shown to be those of a mixture by Berry and Thompson (1962). The status of hydrohausmannite as a mixture was definitively settled by Bricker (1965), who assigned the name feitknechtite to the Me-0(OH) component of this mixture.
Local material has not been much studied and is microscopic; there are no accurate analytical data, and little is known of its occurrence. Frondel reported its occurrence in pyrochroite specimens, but gave no details. Additionally, he reported it as a component of brown needle-like crystals lining solution cavities in a matrix of sussexite, calcite, and zincite. It is not known from Sterling Hill. Feitknechtite has not been studied by [Dunn]. (Dunn, 1995)

 Location Found: Franklin (Type Locality)
 Year Discovered: 1965
 Formula: Mn3+O(OH)
 Essential Elements: Hydrogen, Manganese, Oxygen
 All Elements in Formula: Hydrogen, Manganese, Oxygen
 IMA Status: Approved
 To find out more about this mineral at minDat's website, follow this link   Feitknechtite

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.591

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.55

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 18, No. 1 - March 1977, pg. 12The Post Palache Minerals - Hydrohausmannite / Feitknechtite
View IssueV. 7, No. 2 - August 1966, pg. 8The Minerals of Sterling Hill 1962-65 by Frank Z. Edwards - Feitknechtite (small article)
View IssueV. 7, No. 1 - February 1966, pg. 7Feitknechtite/Hydrohausmannite
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