| 词条 | Daubréeite |
| 释义 |
For the iron chromium sulfide mineral see Daubréelite{{Infobox mineral | name = Daubréeite | boxwidth = | boxbgcolor = | image = | imagesize = | alt = | caption = | category = Oxide mineral | formula = BiO(OH,Cl) | strunz = 3.DC.25 | dana = | system = Tetragonal | class = Ditetragonal dipyramidal (4/mmm) H-M symbol: (4/m 2/m 2/m) | symmetry = P4/nmm | unit cell = a = 3.85, c = 7.4 [Å]; Z = 2 | molweight = | color = Creamy-white, grayish, yellowish-brown | colour = | habit = Compact massive, columnar | twinning = | cleavage = [{001}, perfect | fracture = | tenacity = Very plastic, sectile | mohs = 2-2.5 | luster = Greasy, silky | streak = | diaphaneity = Transparent to translucent | gravity = 6-6.5 | density = | polish = | opticalprop = Uniaxial (-) | refractive = nω = 2.150 nε = 1.910 | birefringence = δ = 0.240 | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | references = [1][2][3] }}Daubréeite is a rare bismuth oxohalide mineral with formula BiO(OH,Cl). It is a creamy-white to yellow-brown, soft, earthy clay–like mineral which crystallizes in the tetragonal crystal system. It is a member of the matlockite group.[1] It was first described for an occurrence in the Constanicia mine, Tazna, Bolivia, in 1876.[4] It was named for French mineralogist Gabriel Auguste Daubrée (1814–1896).[1] At the Tanza location it occurs as a secondary mineral formed by the oxidation of native bismuth or bismuthinite. It occurs with clay minerals.[3] In addition to its discovery location it has also been reported from the Tintic District in the East Tintic Mountains of Juab County, Utah; in the Josephine Creek District of Josephine County, Oregon; in the Manhattan District of Nye County, Nevada; and the Rio Marina Mine on Elba, Italy.[1] References1. ^1 2 3 Daubréeite on Mindat {{DEFAULTSORT:Daubreeite}}{{oxide-mineral-stub}}2. ^Daubréeite on Webmineral 3. ^1 Daubréeite in the Handbook of Mineralogy 4. ^{{cite journal | last = Domeyko | year =1876 | journal = Comptes Rendus de l'Académie des Sciences de Paris | volume =82 | pages= 922–923 | title = Daubréite(oxychlorure de bismuth), espèce minérale nouvelle| url = http://gallica.bnf.fr/ark:/12148/bpt6k30396/f918.image}} 4 : Oxide minerals|Halide minerals|Bismuth minerals|Tetragonal minerals |
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