the mineral's colour is also affected metamict specimens are usually green brown or blackish mu cyiciro cy'ingenzi harimo intwari zose zikiriho zirimo n'abanyeshuri b'i nyange bakiriho cyangwa ngo mubure kuyakoresha mu guteka ibyokurya uko narezwe aho nagiye mba mu bihugu bitandukanye murabizi twavukiye mu mahanga