Introduction:

bementite is a rare manganese mineral that is found in manganese ore deposits and may be associated with typical manganese ore minerals such as hausmannite, jacobsite, braunite and alleghanyite.

Occurrence in Wales:

Bevins (1994) recorded that specimen B.M. 1964, R10624, in the Natural History Museum, London is bementite from Nant Mine, Llŷn. No details are known regarding the method of identification. Recent research into the mineralogy of the Benallt and Nant manganese mines suggests that this is probably a mis-identification of caryopilite (T.F. Cotterell, unpublished data). Particularly given the fact that Kato (1963) considered that much material described as bementite is actually caryopilite and that caryopilite has recently been confirmed from Nant Mine by both XRD and EMPA (Cotterell, 2006).

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