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Paratilapia polleni is a medium-sized cichlid endemic to Madagascar.It is also a popular fish for display at public aquaria. [2] [3]It is sometimes referred to by the common names starry-night cichlid, polleni cichlid, and black diamond cichlid, while marakely (black fish) is one of its native names.
A carbon flaw in a diamond has a severe impact on strength. [4] Any inclusion in a diamond is a weak point in the crystalline structure and will make the stone more prone to breakage. Specifically, if a cloud forms too close to the surface of the diamond, or the diamond is cut too close to a flaw, it will appear as a crack in the surface.
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 ]
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Day shapes are black in color and their sizes are determined by the ColRegs; for example, the size of the ball is not less than 0.6 metres (2.0 ft). The vertical distance between shapes is at least 1.5 metres (4.9 ft). Vessels of less than 20 metres (66 ft) length may use shapes of smaller size commensurate with the size of the vessel. [2]
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Camalot is a brand of spring-loaded camming devices manufactured by Black Diamond Equipment used to secure ropes while rock climbing. Camalots use a dual-axle system, resulting in a slightly higher expansion range than similarly sized single axle units, however that results in significant weight penalty. [ 1 ]