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The Ocean Dream is a diamond, measuring 5.51 carats (1.102 g), and rated in color as Fancy Deep Blue-Green by the Gemological Institute of America. [1] The Ocean Dream is the first and one of the only natural diamonds known to the GIA to possess a blue-green hue (besides the Ocean Paradise Diamond owned by the Nahshonov Group, found in Brazil in 2012), making it one of the rarest diamonds in ...
Diamond also has a very high refractive index and a relatively high optical dispersion. Most natural diamonds have ages between 1 billion and 3.5 billion years. Most were formed at depths between 150 and 250 kilometres (93 and 155 mi) in the Earth's mantle, although a few have come from as deep as 800 kilometres (500 mi). Under high pressure ...
Cobalt-rich crusts (CRCs) form on sediment-free rock surfaces around oceanic seamounts, ocean plateaus, and other elevated features. [31] The deposits are found at depths of 600–7,000 m (2,000–23,000 ft) and form 'carpets' of polymetallic rich layers about 30 cm (12 in) thick at the feature surface.
Diamonds are carbon crystals that form under high temperatures and extreme pressures such as deep within the Earth. At surface air pressure (one atmosphere), diamonds are not as stable as graphite , and so the decay of diamond is thermodynamically favorable (δ H = −2 kJ/mol ). [ 22 ]
A recent study hypothesizes that the nodules are a source of "dark oxygen", oxygen produced without light, which provides the seafloor in the deep ocean with oxygen. [36] However, this study contrasts with many other studies conducted over decades in the deep sea that did not detect oxygen production - and in fact showed only oxygen consumption.
At room temperature, diamonds do not react with any chemical reagents including strong acids and bases. In an atmosphere of pure oxygen, diamond has an ignition point that ranges from 690 °C (1,274 °F) to 840 °C (1,540 °F); smaller crystals tend to burn more easily. It increases in temperature from red to white heat and burns with a pale ...
Examples showing the imposition of the host diamond's morphology on the included mineral in syngenetic inclusions. (a) Inclusion of olivine in diamond with their faces imposed by octahedral (o) and cubic (c) shapes common in diamond. (b) Diamond with several olivine inclusions with faces parallel to the octahedral diamond face. [1] [12] [13]
A proposal that diamonds may also form in Jupiter and Saturn, where the concentration of carbon is far lower, was considered unlikely because the diamonds would quickly dissolve. [ 16 ] Experiments looking for conversion of methane to diamonds found weak signals and did not reach the temperatures and pressures expected in Uranus and Neptune.