ge·o·fact 
(jēō-făkt′)
(jēō-făkt′)n.
A natural rock fragment having the appearance of an artifact made by humans.
[From GEO-, on the model of ARTIFACT.]
- magnetoelectricity
- magnetoencephalogram
- magnetoencephalographic
- magnetoencephalography
- magnetogram
- magnetograph
- magnetometer
- magnetometric
- magnetometry
- magnetomotive force
- magneton
- magnetooptics
- magnetopause
- magnetoresistance
- magnetoresistive
- magnetorheology
- magnetosphere
- magnetospheric
- magnetostriction
- magnetostrictive
- magnetotactic
- magnetotail
- magnetotaxis
- magnetron
- magnet school