File:Goethite (Schley Mine, Gilbert, Minnesota, USA) 1.jpg
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| Description |
English: A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 5600 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates.
The oxide minerals all have one or more oxide anions (O2 -2). Goethite is an iron hydroxy-oxide mineral, FeO(OH). It has a nonmetallic to metallic luster, is usually brown to dark brown in color, has a brownish streak, no cleavage, and is moderately hard (H=5 to 5.5). It typically forms by the oxidation of iron-rich minerals. Goethite forms crystals or fibrous masses of varying morphology, but many samples are massive. This goethite sample from Gilbert, Minnesota is hosted in rocks of the ~1.878 billion year old Biwabik Iron-Formation. The Biwabik is correlative with the Ironwood Iron-Formation and Negaunee Iron-Formation of northern Michigan. Locality: Schley Mine (Schley Pit; now flooded), southeastern side of the town of Gilbert, Mesabi Iron Range, central St. Louis County, northeastern Minnesota, USA (47° 28 51.92" North latitude, 92° 27' 17.86" West longitude) Photo gallery of goethite: www.mindat.org/gallery.php?min=1719 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50549690461/ |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50549690461. It was reviewed on 2 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 16:48, 2 November 2020 | | 3,335 × 2,208 (4.99 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50549690461/ with UploadWizard |
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