Introduction:

a rare manganese oxide hydroxide, trimorphous with manganite and groutite. Feitknechtite typically forms intergrown with hausmannite in a mixture that was previously called hydrohausmannite (Frondel, 1953). Bricker (1965) demonstrated that hydrohausmannite was in fact a mixture of of two phases: hausmannite and the new mineral feiknechtite.

Occurrence in Wales:

feitknechtite has been discovered (Cotterell, 2008) as a component of bladed manganese ore from Benallt Mine at the southern end of Pen Llŷn in Gwynedd. This occurrence matches descriptions of feitknechtite from Franklin, New Jersey, U.S.A., and Långban and Pajsberg, Värmland, Sweden.

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