Metal, iron, & nickel | Some Meteorite Information
That is 100-1000 times greater than practically any terrestrial (earth) rock. An earth rock with as much as 1.0-1.8% Ni would be a nickel ore. In terrestrial rocks the nickel is not contained in metal, however, but in silicate and sulfide minerals. One cannot determine if a rock contains high concentrations of nickel just "by looking."