Crystal type, cleavage, and hardness are determined mostly by the crystal structure with the atomic level. A lot of mantle xenoliths, carried up as nodules in just magma, are eclogites. Eclogites also are uncovered as layers or bands connected to some peridotites. Quite typically, eclogites go through retrograde metamorphism and https://www.generationgenius.com/videolessons/rocks-and-minerals-video-for-kids/