File:Earthy hematite (Black Hills, South Dakota, USA) 4.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 5800 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). Hematite is a common iron oxide mineral (Fe2O3). It varies in appearance, from nonmetallic-lustered and brick red-colored to metallic-lustered and silvery-gray colored. Brick red hematite is often powdery / earthy or finely granular or oolitic. Silvery-gray hematite (micaceous hematite) is less common and results from mild to moderate levels of metamorphism. Hematite ranges in hardness from soft to moderately hard (about 1 to 6 on the Mohs Hardness Scale). Regardless of a specimen’s color or luster, hematite will always leave a brick red-colored streak, which is its most diagnostic physical property. This specimen is earthy hematite, sometimes referred to as "red ochre". Locality: undisclosed / unrecorded site (attributed to the town of Custer) in the Black Hills, western South Dakota, USA Photo gallery of hematite: www.mindat.org/gallery.php?min=1856 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/52674052730/ |
| 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@N05/52674052730. It was reviewed on 7 February 2023 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 | |
|---|---|---|---|---|---|
| current | 16:40, 7 February 2023 | | 1,886 × 1,867 (2.56 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52674052730/ with UploadWizard |
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