NWA meteorite 146 grams separated from a larger meteor on entry to the earth’s atmosphere. Impacting in the Saharan western desert. The iron meteorite displays a glassy molten surface, the interior structure can be observed where surface impact fractures occur.
The impact fragment attains a molten surface on entering the atmosphere of the earth at high speed, the velocity creating immense friction through our upper atmospheres sufficient enough to melt metals and stone. Any brilliant light seen in our lower atmosphere or flash, similar to an explosive force from a meteor is predominantly caused due to the kinetic energy of the speed of the celestial object. Meteors crash through and into our atmosphere at speeds attaining 11 kilometres per second, around 25,000 mph and to the maximum of 72 kilometres per second, around 160,000 mph.
The Chondrite meteorites contain chondrules, these are microscopic spheres which are reputedly the building blocks of our planetary systems. Chondrites by repute originate from asteroids orbiting our solar system. Science can identify Chondrite meteorites which contain up to approximately 20% of iron and nickel, these minute iron and nickel sized spherical mineralised chondrules are often found in iron chondrites.
These Chondrules are formed from molten particles of the solar nebula, by accumulation or coalescence, particles merge together to form asteroid belts which in turn fall to earth as meteorites. These Chondrites differ from iron meteorites due to their low iron content. Most importantly chondrites offer a greater understanding, allowing scientists to further analyse and give great insight into the age of our solar system.