We report a previously undescribed magnetic coccus, designated NMC-1, that was present in surface sediments collected from the pool in Nanjing suburbs. They orientated and navigated along geomagnetic field lines. Transmission electron microscope photographs showed that the NMC-1 contained over ten magnetosomes. The individual mature crystal was 70nm in length and 40nm in width, which were within the calculted stability field for single-domain magnetite. The energy profile of X-rays was collected after electron excitation of the magnetosomes within a single cell. Iron was the predominant detectable element in the particles. Electron diffraction pattern indicated the magnetosomes are single crystals.