Achondrites are a type of stony meteorite that do not contain chondrules, which are small, round particles found in many other meteorites. They are formed from the differentiated crusts of larger bodies, such as asteroids, and are composed mainly of silicate minerals. Achondrites provide valuable information about the early solar system and the processes that shaped planetary bodies. These meteorites are classified into several groups based on their mineral composition and origin. Some well-known types of achondrites include eucrites, which are associated with the asteroid Vesta, and martian meteorites, which originate from the planet Mars. Studying achondrites helps scientists understand the geological history of these celestial bodies.