| 词条 | Daubréelite |
| 释义 |
| name = Daubréelite | boxwidth = | boxbgcolor = | image = Harvard Museum of Natural History. Meteor from Coahuila (DerHexer) 2012-07-20.jpg | imagesize = 260px | alt = | caption = Coahuila meteorite fragment ("type locality"), Mineralogical Museum, Natural History Museum, Harvard University | category = Sulfide mineral | formula = Fe2+Cr3+2S4 | molweight = | strunz = 2.DA.05 | dana = 02.10.01.11 | system = Cubic | class = Hexoctahedral (m{{Overline|3}}m) H-M symbol: (4/m {{Overline|3}} 2/m) | symmetry = Fd3m | unit cell = a = 9.966 Å; Z = 8 | color = Black | colour = | habit = Massive, platy aggregates, exsolution lamellae in troilite | twinning = | cleavage = Distinct | fracture = Uneven | tenacity = Brittle | mohs = 4.5-5 | luster = Metallic | streak = Brown or black | diaphaneity = Opaque | gravity = | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | references = [1][1][2] }}Daubréelite is a rare sulfide mineral. It crystallizes with cubic symmetry and has chemical composition of Fe2+Cr3+2S4. It usually occurs as black platy aggregates.[3] Naming and historyDaubréelite was named after the French mineralogist, petrologist and meteoriticist Gabriel Auguste Daubrée. The mineral was first described in 1876 in the American Journal of Science. Its type locality is the Coahuila meteorite, Bolsom de Mapimí, Coahuila, Mexico. ClassificationIn the Nickel-Strunz classification daubréelite is part of the "Sulfides and Sulfosalts" and further a "metal sulfide with a metal-sulfide ratio of 3:4 and 2:3".[3] OccurrencesDaubréelite is found in iron meteorites as an inclusion in meteoric iron (kamacite and taenite). Further paragenetic minerals are alabandine, enstatite, graphite, plagioclase and schreibersite.[2] According to one source daubréelite has been described from 34 localities.[4] Some notable examples being the ALH 84001 meteorite, Hoba meteorite, and the Canyon Diablo meteorite. The mineral was also found in the Hadley Rille meteorite which was retrieved by the Apollo 15 mission in the Rima Hadley (Mare Imbrium).[5] CrystallographyDaubréelite crystallizes with cubic symmetry with the space group Fd{{Overline|3}}m (4/m {{Overline|3}} 2/m). There are 8 formula units in one primitive cell.[3] See also
References1. ^Daubréelite data on Webmineral {{DEFAULTSORT:Daubreelite}}2. ^1 Daubréelite on the Handbook of Mineralogy 3. ^1 2 {{cite book|last=Strunz|first=Hugo|title=Strunz mineralogical tables : chemical-structural mineral classification system|year=2001|publisher=Schweizerbart|location=Stuttgart|isbn=3-510-65188-X|edition=9|author2=Nickel, Ernest H.}} 4. ^1 {{cite web|title=Daubréelite Mindat|url=http://www.mindat.org/show.php?id=1230&ld=2#themap|publisher=Mindat|accessdate=19 December 2012}} 5. ^{{cite web|title=Hadley Rille|url=http://www.lpi.usra.edu/meteor/index.php?code=11469|publisher=Meteoritical Society|accessdate=19 December 2012}} 2 : Meteorite minerals|Cubic minerals |
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