Carbonado Carbonado Carbonado, commonly known as the "black diamond", is the toughest form of natural diamond. It is an impure form of polycrystalline diamond consisting of diamond, graphite, and amorphous carbon. It is found primarily in alluvial deposits in the Central African Republic and in Brazil. Its natural colour is black or dark grey, and it is more porous than other diamonds. Carbonado diamonds are typically pea-sized or larger porous aggregates of many tiny black crystals. The most characteristic carbonados have been found only in the Central African Republic and in Brazil, in neither place associated with kimberlite, the source of
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