noun[mass noun] Geology & Mining
An iron-containing secondary deposit, largely consisting of oxides and typically yellowish or reddish, occurring above a deposit of a metallic ore.
- In deposits that have been uplifted and exposed on land, the upper sulphides and oxides are invariably oxidized and weathered to a variety of secondary minerals (‘gossan’) by circulating meteoric water.
- Here unusually lustrous crystals to 2.5 cm across occurred in limonite-malachite gossan.
- It was found in gossan from a dump of one of the small mines on the southeastern side of the mountain on the World's Fair claim group.
Late 18th century: of unknown origin.
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