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
Carbonado, Washington its possession. The time that Carbonado did spend as a coal mining town is forever kept by the cemetery, abandoned mines, a grown-over coal slag pile, a school, and the company houses left behind. The cemetery holds the memories of older and more recent dead with many of the graveholders family still living nearby. Huge concrete monoliths that once held that cables for the mining carts, point straight towards the old mine shafts and openings and stand overgrown and utilized now only by the town's children. One hill in town started out as the coal slag pile and now has