File:Gypsum (Moenkopi Formation, Lower Triassic; Route 9 roadcut between Hurricane & Rockville, Utah, USA) 4.jpg
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English: Gypsum plate from the Triassic of Utah, 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 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. The sample seen here is evaporitic gypsum from a Triassic redbed succession in Utah. The dark red coloration is from hematite (Fe2O3 - iron oxide). Stratigraphy: float from gypsiferous red shales in the Moenkopi Formation, Lower Triassic Locality: loose piece from roadcut along the northern side of Route 9, between the towns of Hurricane and Rockville, eastern Washington County, southwestern Utah, USA Photo gallery of gypsum: www.mindat.org/gallery.php?min=1784 |
| Date | Taken on 27 May 2020, 16:00:36 |
| Source | https://www.flickr.com/photos/47445767@N05/49943815646/ |
| 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@N05/49943815646. It was reviewed on 13 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 02:10, 13 October 2020 | | 1,801 × 994 (1.59 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49943815646/ with UploadWizard |
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