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Carbonado, commonly known as black diamond, is one of the toughest forms of natural diamond. It is an impure, high-density, micro-porous form of polycrystalline diamond consisting of diamond, graphite , and amorphous carbon , with minor crystalline precipitates filling pores and occasional reduced metal inclusions. [ 1 ]
The Sergio (Portuguese: Carbonado do Sérgio) was the largest carbonado and the largest rough diamond ever dug up on earth. [1] It weighed 3,167 carats (633.4 g; 20.36 ozt) and was found above ground in Lençóis (State of Bahia, Brazil) in 1895 by Sérgio Borges de Carvalho. Like other carbonados, it is believed to be of meteoritic origin.
Black Diamonds: Mountaintop Removal & The Fight for Coalfield Justice is a 2006 documentary film made and directed by filmmaker Chet Pancake. [1] The narration in the film is by actress Lauren Graham. The film is about the impact of mountaintop removal mining on the mountains, environment, and people in the Appalachia area of West Virginia.
There should be a separate article on black diamonds. Not every black diamond is a carbonado. Boart is also a black diamond. Most gemstones that are sold today are actually near-white diamonds that are irradiated to alter the color. Probably also worth mentioning that hematite was once marketed as "black diamond." Apparently that's no longer ...
The majority of mined diamonds fall between white and pale yellow or brown; what is known as the normal color range. Diamonds of more intense color (usually yellow, but in some cases red, green or blue) are termed fancy color diamonds. Black diamonds are also fancy color diamonds. All other factors being equal, the most valuable diamonds are ...
Most Ia diamonds are a mixture of IaA and IaB material; these diamonds belong to the Cape series, named after the diamond-rich region formerly known as Cape Province in South Africa, whose deposits are largely Type Ia. Type Ia diamonds often show sharp absorption bands with the main band at 415.5 nm (N3) and weaker lines at 478 nm (N2), 465 nm ...
Morton vs. Diamond Crystal. Morton has been headquartered in Chicago since 1848, and in 1914 introduced the iconic umbrellaed Morton Salt Girl to emphasize the free-flowing quality of its table ...
Bort-like heavily twinned diamond from Congo. Bort is commonly used as an abrasive. Smaller flakes and particles are used as an additive for scouring or polishing pastes and agents. Larger particles can be added to cutting, drilling and grinding tools to improve their lifespan and substantially increase their efficiency. [4]