21. This mineral has been found in meteorites including irons and CV carbonaceous chondrites . 22. Only CV chondrites are more strongly enriched in magnesium. 23. It is a breccia, one of only five known enstatite chondrite breccias. 24. Their mineral composition lies between H and E chondrites . 25. Chondrite meteorites are classified using the oxygen isotope ratios.26. Chondrites are often considered to be " the building blocks of the planets ".27. However, no hydrated minerals were detected, suggesting no link with carbonaceous chondrites . 28. There are currently over 27, 000 chondrites in the world's collections. 29. The various chondrite groups likely originated on separate asteroids or groups of related asteroids. 30. From the carbonaceous chondrites , we follow the trail to the most primitive materials.
