| 词条 | Nichromite |
| 释义 |
|name=Nichromite | category = Spinel group | formula = (Ni,Co,Fe)(Cr,Fe,Al)2O4 | strunz = 4.BB.05 | system = Isometric | class = Hexoctahedral (m{{overline|3}}m) H-M symbol: (4/m {{overline|3}} 2/m) | symmetry = Fd{{overline|3}}m | unit cell = a = 8.32 Å; V = 573.86 Å3; Z = 8 | color = Dark green, black | habit = Granular, anhedral to subhedral | mohs = 6-{{frac|6|1|2}} | fracture = Conchoidal | luster = Metallic | refractive = | opticalprop = Isotropic | pleochroism = | streak = Greyish green | gravity = 5.10 |diaphaneity = Opaque |references=[1][2][3][4]Nichromite (Ni,Co,Fe)(Cr,Fe,Al)2O4[1] is a black cubic metallic mineral and member of the spinel group.[5] Nichromite was originally reported from the Bon Accord nickel deposit in Barberton District, South Africa.[1] Occurring naturally in a nickel deposit, nichromite is named for chromite with dominant nickel.[2] The atomic arrangement of the spinel group is a commonly studied structure and characteristically has four closely packed oxygen atoms. The nickel atoms are organized corresponding to a "normal" spinel arrangement.[6] The mineral has only been found in the Bon Accord Nickel Deposit in South Africa where it is formed by replacing chromite and rimmed by trevorite.[4] References1. ^1 2 Nichromite on Mindat.org {{Oxide-mineral-stub}}2. ^1 Nichromite on Webmineral 3. ^Sawaokaa,A.,Saitoa,S.,Inoueb,K. and Asadab,T. (1971)Effect of high pressure on the lattice constants of chromites having the spinel structure. Materials Research Bulletin, 6, 97-101. 4. ^1 Cabri, L. J., Chao G.Y., Pabst, Adolf, Fleischer, Michael. (1980) New Mineral Names. American Mineralogist, 65, 811. 5. ^Glossary of Geology 6. ^Wyckoff, R.W.G. (1965) Crystal Structures (Second Edition). 75-86 p. University of Arizona, Tucson, Arizona. 2 : Spinel group|Cubic minerals |
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