File:Gypsum-cemented sand (possibly Mexico) 2.jpg
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| Description |
English: (~5.9 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 6000 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 sulfate minerals all have one or more sulfate anions (SO4 -2). Gypsum is a moderately common hydrous calcium sulfate mineral (CaSO4·2H2O). Gypsum has a nonmetallic luster, is usually clearish to whitish, is soft (H≡2), and rather fragile/brittle. Gypsum has 3 cleavage planes, one of which is well developed (“one good cleavage), and the other two are not well developed (“two poor cleavages”). Broken gypsum specimens are frequently thin plates - the consequence of the one good cleavage plane. Unbroken crystals show monoclinic symmetry. Gypsum has economic value as a mineral. It is the starting ingredient for making plaster and wallboard. Translucent rock gypsum ("alabaster") has been carved to make decorative objects. The specimen seen here consists of grayish-brown bladed gypsum composed of tightly-packed fibers intergrown with sandy sediments. Locality: unrecorded / undisclosed site (possibly from Mexico) Photo gallery of gypsum: www.mindat.org/gallery.php?min=1784 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/53529196036/ |
| 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@N05/53529196036. It was reviewed on 26 March 2024 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 | 20:20, 26 March 2024 | | 2,423 × 1,526 (3.39 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53529196036/ with UploadWizard |
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