File:Magnesitite (magnesite rock) (Grenville Front area, western Quebec, Canada) 5.jpg
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| Description |
English: Magnesitite (= magnesite rock) from Canada.
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 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. The sample seen here looks like a marble, but it's not composed of calcite (it won't bubble in cold acid). It is a monomineralic, crystalline-textured, magnesite rock, which is called magnesitite. Locality: unrecorded site in the Grenville Front area of western Quebec, Canada Photo gallery of magnesite: www.mindat.org/gallery.php?min=2482 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/50712874891/ |
| 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@N05/50712874891. It was reviewed on 14 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 19:37, 14 December 2020 | | 2,177 × 2,093 (3.06 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50712874891/ with UploadWizard |
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