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Gossan (eiserner hut or eisenhut) is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein. In the classic gossan or iron cap all that remains is iron oxides and quartz often in the form of boxworks, quartz lined cavities retaining the shape of the dissolved ore minerals. In other cases quartz and iron oxides, limonite, goethite, and jarosite, exist as pseudomorphs replacing the pyrite and primary ore minerals. Frequently gossan appears as a red stain against the background rock and soil due to the abundance of oxidized iron and the gossan may be a topographic positive area due to the abundance of erosion resistant quartz and iron oxides. Although most gossans are red, orange, or yellow, black gossans from manganese oxides su

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  • Eiserner Hut
  • Gossan
  • Montera de hierro
  • Chapeau de fer
  • Cappellaccio
rdfs:comment
  • On appelle chapeau de fer la zone exposée en surface et oxydée d'un dépôt métallifère. Elle présente un aspect plus ou moins alvéolaire et des teintes jaunâtres à brun rouge. Le chapeau de fer est riche en oxydes et hydroxydes de fer (limonite) formés par action des agents atmosphériques sur des gisements de sulfures.
  • Las monteras de hierro o gossan son rocas formadas por la oxidación de sulfuros de hierro que pueden formar depósitos minerales. La formación de las monteras de hierro depende de factores como el clima, la composición inicial de los sulfuros, el nivel freático o el relieve. Su presencia puede aportar información sobre yacimientos minerales que puedan estar presentes en profundidad, o bien constituir yacimientos por sí mismas. Pueden ser fuentes de oro, plata y estaño.
  • Gossan (eiserner hut or eisenhut) is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein. In the classic gossan or iron cap all that remains is iron oxides and quartz often in the form of boxworks, quartz lined cavities retaining the shape of the dissolved ore minerals. In other cases quartz and iron oxides, limonite, goethite, and jarosite, exist as pseudomorphs replacing the pyrite and primary ore minerals. Frequently gossan appears as a red stain against the background rock and soil due to the abundance of oxidized iron and the gossan may be a topographic positive area due to the abundance of erosion resistant quartz and iron oxides. Although most gossans are red, orange, or yellow, black gossans from manganese oxides su
  • Eiserner Hut ist ein bergmännischer Ausdruck für die Oxidationszone eines Erzganges. Sein Name leitet sich vom Brauneisen her, welches „das auffälligste Mineral der Verwitterungszone ist“. Die ursprünglich vorhandenen Fluss- und Schwerspate wurden in wässrige Lösung überführt und weggespült, so dass der Quarz als einzige Gangart übriggeblieben ist und die Edelmetalle, die nicht lösbar sind, sich angereichert haben. Insbesondere das Silber tritt in der Verwitterungszone zum Teil gediegen und als Argentit oder als Akanthit auf.
  • In geologia, si definisce gergalmente cappellaccio quella parte di materiale lapideo della cava che presenta alterazioni, infiltrazioni o discontinuità rispetto alla roccia compatta sostanzialmente inalterata. Spesso questo rappresenta la porzione superficiale della terra e di roccia in stato di decomposizione, sovrastante la massa rocciosa subaffiorante, caratteristica che ne definisce il nome.
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  • Eiserner Hut ist ein bergmännischer Ausdruck für die Oxidationszone eines Erzganges. Sein Name leitet sich vom Brauneisen her, welches „das auffälligste Mineral der Verwitterungszone ist“. Die ursprünglich vorhandenen Fluss- und Schwerspate wurden in wässrige Lösung überführt und weggespült, so dass der Quarz als einzige Gangart übriggeblieben ist und die Edelmetalle, die nicht lösbar sind, sich angereichert haben. Insbesondere das Silber tritt in der Verwitterungszone zum Teil gediegen und als Argentit oder als Akanthit auf. Diese Verwitterungszone der Erzgänge reicht von der Erdoberfläche bis zur Zementationszone, die eine scharfe Grenze zur tieferen, primären Gangstruktur mit wesentlich geringeren Erzgehalten bildet.
  • Gossan (eiserner hut or eisenhut) is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or mineral vein. In the classic gossan or iron cap all that remains is iron oxides and quartz often in the form of boxworks, quartz lined cavities retaining the shape of the dissolved ore minerals. In other cases quartz and iron oxides, limonite, goethite, and jarosite, exist as pseudomorphs replacing the pyrite and primary ore minerals. Frequently gossan appears as a red stain against the background rock and soil due to the abundance of oxidized iron and the gossan may be a topographic positive area due to the abundance of erosion resistant quartz and iron oxides. Although most gossans are red, orange, or yellow, black gossans from manganese oxides such as pyrolusite, manganite, and especially psilomelane form at the oxidized portion of Mn-rich mineral deposits. In the 19th and 20th centuries gossans were important guides to buried ore deposits used by prospectors in their quest for metal ores. An experienced prospector could read the clues in the structure of the gossans to determine the type of mineralization likely to be found below the iron cap.
  • On appelle chapeau de fer la zone exposée en surface et oxydée d'un dépôt métallifère. Elle présente un aspect plus ou moins alvéolaire et des teintes jaunâtres à brun rouge. Le chapeau de fer est riche en oxydes et hydroxydes de fer (limonite) formés par action des agents atmosphériques sur des gisements de sulfures.
  • Las monteras de hierro o gossan son rocas formadas por la oxidación de sulfuros de hierro que pueden formar depósitos minerales. La formación de las monteras de hierro depende de factores como el clima, la composición inicial de los sulfuros, el nivel freático o el relieve. Su presencia puede aportar información sobre yacimientos minerales que puedan estar presentes en profundidad, o bien constituir yacimientos por sí mismas. Pueden ser fuentes de oro, plata y estaño.
  • In geologia, si definisce gergalmente cappellaccio quella parte di materiale lapideo della cava che presenta alterazioni, infiltrazioni o discontinuità rispetto alla roccia compatta sostanzialmente inalterata. Spesso questo rappresenta la porzione superficiale della terra e di roccia in stato di decomposizione, sovrastante la massa rocciosa subaffiorante, caratteristica che ne definisce il nome. Se per esempio un blocco di marmo bianco di Carrara ha caratteristiche di compattezza, venatura ed uniformità di colore, un blocco di cappellaccio, essendo stato a contatto con strati terrosi o composti da altre rocce, si presenta solitamente bianco giallastro, con infiltrazioni marroni, porosità ed altre imperfezioni che ne pregiudicano il valore estetico e la compattezza.
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