Carbonado typical gem diamonds. Lead isotope analyses have been interpreted as documenting crystallization of carbonados about 3 billion years ago. The carbonados are found in younger sedimentary rocks. Mineral grains included within diamonds have been studied extensively for clues to diamond origin. Some typical diamonds contain inclusions of common mantle minerals such as pyrope and forsterite, but such mantle minerals have not been observed in carbonado. In contrast, some carbonados do contain inclusions of minerals characteristic of the Earth's crust: these inclusions do not necessarily establish formation of the diamonds in the crust, however, because while these obvious crystal inclusions occur
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