File:Magnesite piece.jpg
Original file (1,219 × 852 pixels, file size: 1.44 MB, MIME type: image/jpeg)
Captions
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Summary
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| Description |
English: Magnesite - a chalky/earthy mass. (4.9 centimeters across at its widest)
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 carbonate minerals all contain one or more carbonate (CO3-2) anions. Magnesite is a magnesium carbonate mineral (MgCO3). It forms a chemical spectrum with dolomite (CaMg(CO3)2) and calcite (CaCO3). It often forms coarsely-crystalline masses or chalky/earthy masses. It has a nonmetallic luster and can be any color, but is often whitish. It has a white streak, a hardness of about 3.5 to 4.5, and rhombohedral cleavage (= same cleavage as calcite). Magnesite is usually the result of metamorphic chemical alteration of Mg-bearing rocks such as peridotites and serpentinites by the action of carbonic acid-rich fluids. Photo gallery of magnesite: www.mindat.org/gallery.php?min=2482 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/31828242330/ |
| 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@N05/31828242330. It was reviewed on 1 November 2022 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 | 16:29, 1 November 2022 | | 1,219 × 852 (1.44 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/31828242330/ with UploadWizard |
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