Pallasites are a type of iron meteorite, incredibly rare, made out of large olivine crystals in an iron-nickel matrix – and they look just fabulous. Olivine is a a magnesium iron silicate quite common in our planet’s subsurface, but which weathers fast when exposed to the surface. Only 64 have been found. [more]
Chondrites are stony (non-metallic) meteorites that have not experienced any melting. They are formed when various types of dust and small grains accumulate to form primitive asteroids. These are the most common type of meteorite falling to Earth. One of their characteristics is the presence of chondrules, which are round grains formed by distinct minerals. The chondrule contents may have gone on forming and broken through the chondrite droplet boundaries, so the chondrules become less and less distinct, grading into a fine-grained holocrystalline rock. This is a holocrystalline chondrite with chondrules no longer distinguishable. [more]
The Widmanstätten pattern is commonly found in iron meteorites. The distinctive internal structure is formed as the liquid metal at the core of a newly formed meteorite (comprising mostly nickel and iron) cools very slowly over thousands of years.The result is a lattice of nickel-iron crystals unlike anything seen here on Earth. [more]
Let me repeat: these are all flying space rocks that attacked Earth.