Carbonado typical gem diamonds. Lead isotope analyses have been interpreted as documenting crystallization of carbonados about 3 billion years ago. The carbonados are found in younger sedimentary rocks. Mineral grains included within diamonds have been studied extensively for clues to diamond origin. Some typical diamonds contain inclusions of common mantle minerals such as pyrope and forsterite, but such mantle minerals have not been observed in carbonado. In contrast, some carbonados do contain inclusions of minerals characteristic of the Earth's crust: these inclusions do not necessarily establish formation of the diamonds in the crust, however, because while these obvious crystal inclusions occur
Carbonado, Washington the poverty line, including 2.9% of those under age 18 and none of those age 65 or over. Frank Robinson, founder and CEO of Robinson Helicopters was born in Carbonado in 1930. Carbonado School District is a historical school district which started in 1887. Paul Strand, pitcher (6-2), World Champion Boston Braves, born in Carbonado, 1893. Carbonado, Washington Carbonado is a town in Pierce County, Washington, United States. Carbonado is located near the Carbon River in northern Pierce County, approximately 50 miles (80 km) southeast of Seattle. Carbonado is the last town before entering Mount Rainier National Park and is