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
Now That's What I Call Classic Rock Hits Now That's What I Call Classic Rock Hits Now That's What I Call Classic Rock Hits is one of many genre-themed compilation albums from the "Now!" series in the United States, this one focusing on popular classic rock songs from the 1970s. It was released on May 1, 2012. In his review for Allmusic, Gregory Heaney says "the Now series delivers a dose of good ol' classic rock with "Now That's What I Call Classic Rock Hits"," which "gathers some of rock's most enduring crossover hits." "Now That's What I Call Classic Rock Hits" is "an album that achieves its