File:Turgite on flint (Vanport Flint, Middle Pennsylvanian; Nethers Flint Quarries, Flint Ridge, Ohio, USA) 10.jpg
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English: Turgite on flint from the Pennsylvanian of Ohio, USA.
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 5500 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 contain one or more oxide anions (O-2). The oxide minerals include species that are hydroxy-oxides. The hydroxide minerals (those with one or more OH-) are usually considered together with the oxides. Many sulfide minerals are not stable in Earth-surface conditions. In the presence of oxygen and moisture, sulfide minerals tend to tarnish or alter to oxides and hydroxy-oxides. All except the most inert elements (such as the platinum-group elements and gold and noble gases) readily form oxides. Gold oxide forms only under special conditions. The exact nature of the material called turgite is not agreed upon. Some mineralogists consider turgite to be a mixture of hematite and goethite that results from goethite alteration. Others regard turgite as a hydrous hematite mineral (2Fe2O3·H2O). Regardless, turgite is fascinating and beautiful material. Turgite often occurs as rainbow-colored iridescent coatings on iron oxide-rich rocks or rocks having surficial iron oxide staining. It can also occur as irregularly botryoidal masses. Seen here is turgite coating a fracture in chert ("flint") from Flint Ridge, Ohio. Stratigraphy: Vanport Flint, Allegheny Group, upper Middle Pennsylvanian Locality: Nethers Flint Quarries - flint pit in the woods on the southwestern side of Flint Ridge Road, eastern Flint Ridge, far-western Muskingum County, east-central Ohio, USA (GPS: 40° 00.137’ North latitude, 82° 11.544’ West longitude) Photo gallery of turgite: www.mindat.org/gallery.php?min=11396 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/49972689936/ |
| 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@N05/49972689936. It was reviewed on 18 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 04:12, 18 November 2020 | | 1,882 × 1,051 (2.11 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49972689936/ with UploadWizard |
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