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gossan
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Definitions of gossan in various dictionaries:
noun - a type of decomposed rock
GOSSAN - Gossan (eiserner hut or eisenhut) is intensely oxidized, weathered or decomposed rock, usually the upper and exposed part of an ore deposit or minera...
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Dirt and stunted, decomposed rock |
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Jan 1 2012 The Times - Cryptic |
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An exposed, oxidized portion of a mineral vein, especially a rust-colored outcrop of iron ore. |
An iron-containing secondary deposit, largely consisting of oxides and typically yellowish or reddish, occurring above a deposit of a metallic ore. |
Gossan description |
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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 such as pyrolusite, manganite, and especially psilomelane form at the oxidized portion of Manganese-rich mineral deposits. * In the 19th and 20th centuries gossans were important guides to buried ore depo |