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 Carbonado—the company also owned the houses and the energy resources as well. The energy resource in Carbonado was also the raw material that the citizens of the company town were harvesting, coal. During the time of the initial boom in the valley Carbonado grew to rival the size of Tacoma at the time. The railroad, which was integral to the transportation of people, of the raw materials harvested and the supplies need by the towns, stretched all the way up the valley too. Not only did it service the towns but also several homesteads farther up the valley. These homesteads