Detrital and authigenic（？） baddeleyite（ZrO_2） in ferromanganese nodules of Central Indian Ocean Basin

Occurrence of baddeleyite（ZrO2） which is a rare mineral has been recorded in ferromanganese nodules of Central Indian Ocean Basin（CIOB）.The mineral occurs either as independent isolated sub-rounded to elliptical grains or in clusters forming fine subhedral crystals（