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
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