Meteoric substances are rocks that have composition significantly different from earth rocks. Meteorites have traditionally been divided into three broad categories: stony meteorites are rocks, mainly
composed of silicate minerals; iron meteorites are largely composed of metallic iron-nickel; and, stony-iron meteorites contain large amounts of both metallic and rocky material. [Wikipedia]
An object of extraterrestrial origin that survives entry through the atmosphere to reach the Earth's surface. Meteors become meteorites if they reach the ground.
A solid object in interplanetary space before it reaches the Earth's atmosphere. Meteoroids are of silicate and/or metallic matter having a size from tiniest grains up to that of the smallest asteroid
s.