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
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