gossan

gossan
/gos"euhn, goz"-/, n.
a rust-colored deposit of mineral matter at the outcrop of a vein or orebody containing iron-bearing materials. Also called iron hat.
[1770-80; orig. dial. (Cornwall) < Cornish, deriv. of gos blood; akin to Welsh gwaed]

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also spelled  gozzan  

      rust-coloured oxide and hydroxide minerals of iron and manganese that cap an ore deposit. Gossans form by the oxidation of the sulfide minerals in an ore deposit and they thus may be used as clues to the existence of subsurface ore deposits, especially if distinctive boxworks are present.

      In addition to hydrous oxides of iron and manganese, gold and silver in the native (natural, nearly pure) state and various sulfate, carbonate, and silicate minerals can occur in gossans. The hydrous oxide minerals occur as the residuum when sulfide minerals are dissolved from the outcrops; they are either indigenous (i.e., fixed at the site of the original sulfide mineral) or transported. Indigenous hydrous oxides indicate the presence of copper, whereas transported hydrous oxides indicate its absence or its presence in very low proportion to iron and manganese. See also boxwork.

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Universalium. 2010.

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Look at other dictionaries:

  • Gossan — 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… …   Wikipedia

  • Gossan — Gos san, n. (Geol.) Decomposed rock, usually reddish or ferruginous (owing to oxidized pyrites), forming the upper part of a metallic vein. Called also {iron hat}. [1913 Webster] …   The Collaborative International Dictionary of English

  • gossan — [gäs′ən, gäz′ən] n. [Cornish gossen < gos, blood < Old Cornish guit] Mining rusty iron deposits often occurring where the upper part of a vein has been weathered and oxidized …   English World dictionary

  • Gossan — This rare and interesting name is of medieval English origin and is a variant spelling of Gosson, an assimilated form of Godson, and derived form the Old English pre 7th Century godsuna , godson. In the York miracle plays Gud sonne , meaning good …   Surnames reference

  • Gossan Gbéké — Gossan Kwa Gbeke Gossan Kwa Gbeke était un chef baoulé en Côte d Ivoire au XIXe siècle. Connu dans sa région pour son charisme, son autorité et sa grande sagesse, il règna sur la ville de Gbekekro à qui il donna son nom. Issu de la tribu des… …   Wikipédia en Français

  • Gossan Kwa Gbeke — était un chef baoulé en Côte d Ivoire au XIXe siècle. Connu dans sa région pour son charisme, son autorité et sa grande sagesse, il règna sur la ville de Gbekekro à qui il donna son nom. Issu de la tribu des Assabous (groupe Akan), il suivit la… …   Wikipédia en Français

  • gossan — noun Etymology: Cornish gossen, from gōs blood Date: 1776 decomposed rock or vein material of reddish or rusty color that results from oxidized pyrites …   New Collegiate Dictionary

  • gossan — [ gɒz(ə)n] noun Geology & Mining an iron containing secondary deposit of oxides, typically yellowish or reddish, occurring above an ore deposit. Origin C18: prob. of Cornish origin …   English new terms dictionary

  • gossan — gos·san …   English syllables

  • gossan — gos•san [[t]ˈgɒs ən, ˈgɒz [/t]] n. gel mir a rust colored, oxidized deposit along an exposed iron bearing vein • Etymology: 1770–80; orig. dial. (Cornwall) < Cornish, der. of gōs blood; akin to Welsh gwaed …   From formal English to slang

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