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
Carbonado, Washington and with it came the end of the need for the lower grade coal being mined at Carbonado and the timber being harvested for use in the settlements further up the valley. Since the decline of the mining era, Carbonado has experienced extreme shrinking and small booms ultimately ending with a steady population. All of the current residents work elsewhere and what was once an economic center for the valley is now a residential community. The railroad also pulled out and destroyed its towns quite recently. The Rails to Trails project has most of the actual rail line land in