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 Is Dead—Long Live Rock! applicable): Also, "Ambition" was performed by Pete Townshend on an episode of In the Attic; he claimed The Who recorded a version during these sessions which was never released. It was originally intended to be released online in conjunction with the "Quadrophenia" box set, but was later omitted. Rock Is Dead—Long Live Rock! Rock Is Dead—Long Live Rock was the title of an unreleased 1972 autobiographical album by the British rock band The Who. In the liner notes for the Who's 1974 rarities collection "Odds & Sods", guitarist and lead songwriter Pete Townshend said, "I had an idea once for