Introduction:

a manganese oxide belonging to the rutile group of minerals, it is trimorphous (has the same composition but a different atomic strucure) with akhtenskite and ramsdellite. Pyrolusite is a secondary mineral which forms by alteration of manganese ore minerals.

Occurrence in Wales:

pyrolusite is probably widespread in Wales, although there are few specific records of its occurrence. Bevins (1994) reported pyrolusite from Benallt Mine, on LlÅ·n and from Ty-Coch, in South Wales on the basis of X-ray diffraction analyses at the Natural History Museum, London. Research into the characterization of manganese species from across Wales has produced four further localities (T.F. Cotterell, unpublished data).

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