Sericho. Pallasite meteorite. EndCut02/11/2021
Martian (shergottite). NWA 12269. Rock from Mars04/11/2021
Chondrites are called so because they contain chondrules. Chondrules were molten droplets of silicates in space that accreted together with some free metals to form the first asteroids 4550 million years ago. They are older than the Earth. Ordinary chondrites are the most common type of chondrites. This type represents about 94% of all chondrites, 87% of stony meteorites in general, and 83% of all meteorites. They are divided according to the amount of iron within their structures and by the degree of thermal metamorphism (read chondrite). Depending on their metallic iron content, they are divided into 3 groups: H, L and LL. H means high iron content, L is low iron content and LL is very low iron content. Consequently, an ordinary chondrite with very well defined chondrules and a high metallic iron content would be classified as an H3. On the other hand, if it has no apparent chondrules and a very low iron content it would be an LL6 or LL7. If the chondrite has semi-defined chondrules and a low iron content it would be classified as an L4 or L5.