21. "Kimberlite " is a type of rock which sometimes contains diamonds. 22. He meant Stewart, with Kimberlite Pipe, and Barnett, with Answer Lively. 23. And that ton of kimberlite will yield just a single carat, on average. 24. Stewart made his Derby debut in 1999 with Kimberlite Pipe, who finished sixth. 25. The project is for a kimberlite mine 150 meters ( 500 feet ) deep. 26. The Cullinan kimberlite was discovered in 1902 and in 1903 open pit mining commenced. 27. Garnet harzburgite xenoliths from kimberlites in South Africa have been particularly well-characterized. 28. The first kimberlite deposit, Zarnitsa mine, was discovered on 21 August 1954. 29. It was emplaced during a period of kimberlite volcanism in the Late Cretaceous epoch. 30. The article isn't clear about the relationship between kimberlite and diamond ore.
