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Primary diamond deep in the ground outside the office (130--180Km) high temperature (900--1300 ℃) high pressure (45--60) & 215; crystallization under 108Pa made.
The main store in kimberlite or lamproite, which form's quite old. Kimberlite diamonds origin, such as South Africa Kimberley mine was formed about 3.3 billion years ago, the age of the Earth is almost the same age; and lamproites type of diamond fields, such as the Argyle mine in Australia, Botswana Ola primary ore, although young, has 1.58 billion years respectively and 990 million years. Hidden in the depths of such a large underground millions of years of diamond crystals to a bright future, have to contribute to the volcanic eruption, lava flows containing diamonds to the Earth's near-surface magma into the office, or long-distance migration of sand deposited on the river in. The former is a native form of tubular mine, which was formed by alluvial mine. Another diamond output in outer space, space impact 'nanodiamonds', it is also pure single 'carbon simple substance' characteristics.
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