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
My Boyfriend Is Type B male, which supposedly makes him arrogant, hardheaded, and generally a jerk, whereas Ha-mi is a type-A female, one who supposedly can't help being timid and obedient. But while Chae-young predicts impending doom, the happy couple try to give love a shot, ignoring their supposed blood type incompatibility. My Boyfriend Is Type B My Boyfriend is Type B () is a 2005 South Korean romantic comedy film. The basic premise of the film comes from the blood type personality theory, which claims that a person's blood type can determine their personality traits. The heroine is type A (conservative and introverted) while