An achondrite is a type of stony meteorite whose precursor was of chondritic origin and experienced metamorphic and igneous processes. They have a planetary or differentiated asteroidal origin where the chondritic parent body reached a sufficient size that through heating due to radioactive decay of 26Al (aluminum isotope) and gravitational Click on Term to Read More that exploded over the Egyptian town of El-Nakhla, on June. 28, 1911. The Nakhla Work in progress. A solid natural object reaching a planet’s surface from interplanetary space. Solid portion of a meteoroid that survives its fall to Earth, or some other body. Meteorites are classified as stony meteorites, iron meteorites, and stony-iron meteorites. These groups are further divided according to their mineralogy and Click on Term to Read More broke into ~40 fragments, one of which allegedly (though this has never been proved) killed a dog. The meteorite was later identified as belonging to an exclusive group of objects, known as SNC meteorites, which come from the surface of Mars.