Material properties of diamond these are known as ballas and are important to industry as they lack the cleavage planes of single-crystal diamond. Carbonado is a similar opaque microcrystalline form which occurs in shapeless masses. Like ballas diamond, carbonado lacks cleavage planes and its specific gravity varies widely from 2.9 to 3.5. Bort diamonds, found in Brazil, Venezuela, and Guyana, are the most common type of industrial-grade diamond. They are also polycrystalline and often poorly crystallized; they are translucent and cleave easily. Because of its great hardness and strong molecular bonding, a cut diamond's facets and facet edges appear the flattest and sharpest. A
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