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 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