Carbonado in the pores that are common in carbonados, they may have been introduced after carbonado formation. Inclusions of other minerals, rare or nearly absent in the Earth's crust, are found at least partly incorporated in diamond, not just in pores: among such other minerals are those with compositions of Si, SiC, and Fe‑Ni. No distinctive high-pressure minerals, including the hexagonal carbon polymorph, lonsdaleite, have been found as inclusions in carbonados, although such inclusions might be expected if carbonados formed by meteorite impact. Isotope studies have yielded further clues to carbonado origin. The carbon isotope value is very low (little carbon‑13
Rock Island 886 Rock Island 886 Chicago, Rock Island & Pacific 886 is a 4-6-2 Pacific type steam locomotive built in 1910 by the American Locomotive Company for the Rock Island Railroad. The locomotive's real number is 887. It was renumbered 886 in July 1955 when donated for display. The real 886 was already scrapped when the city of Peoria asked the Rock Island to donate the 886 for display since it was the last steam locomotive to operate out of Peoria. What happened in the end was that the Rock Island offered 887, an identical model to the 886, to be renumbered