METEORITES & TEKTITES

Meteorites fall to Earth frequently, but are not common in any significant size of object, nor are they easy to find when you consider that 80% of Earths surface is covered with water and much of the land is either remote or inaccessible.
A tektite is a naturally occuring glass composed of material of terrestial origin formed as a result of the high temperatures of a meteor fall or aerial explosion, as in the case of Libyan Desert Glass.