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 Island 886 Rock Island 886 Chicago, Rock Island & Pacific 886 is a 4-6-2 Pacific type steam locomotive built in 1910 by the American Locomotive Company for the Rock Island Railroad. The locomotive's real number is 887. It was renumbered 886 in July 1955 when donated for display. The real 886 was already scrapped when the city of Peoria asked the Rock Island to donate the 886 for display since it was the last steam locomotive to operate out of Peoria. What happened in the end was that the Rock Island offered 887, an identical model to the 886, to be renumbered