Question

Which one of the following is the finest quality of iron ore?A. HaematiteB. LimoniteC. MagnetiteD. Siderite

Notwithstanding molten rocks, magnetite likewise happens in sedimentary rocks, including joined iron developments, and in the lake and marine residue as both detrital grains and as magneto fossils. Magnetite nanoparticles are likewise thought to shape in soils, where they presumably oxidize quickly to maghemite. The compound synthesis of magnetite is Fe2+Fe23+O42−. The principal subtleties of its structure were set up in 1915. It was one of the primary precious stone structures to be acquired utilizing X-beam diffraction. The structure is opposite spinel, with O2− particles framing a face-focused cubic grid and iron cations involving interstitial locales. A big part of the Fe3+ cations possess tetrahedral locales while the other half, alongside Fe2+ cations, involve octahedral destinations. The unit cell comprises 32 O2− particles and the unit cell length is ${\text{a}} = 0.839$ nm. Magnetite contains both ferrous and ferric iron, requiring conditions containing halfway degrees of oxygen accessibility to shape.