File:Ulexite (Kern County, California, USA).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 5900 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.
Ulexite is a rare borate mineral that forms in some arid lacustrine and desert salt flat environments. Its formula is NaCaB5O6(OH)6·5H2O - hydrous sodium calcium hydroxy-borate. It often forms compact, fibrous masses. When cut perpendicular to the fibers and then polished, pieces of ulexite display fiber-optic properties. In this photo, the background text is not visible because the mineral specimen is transparent; instead, the image has been lifted to the top surface. Such pieces are nicknamed "TV rock". Ulexite has a nonmetallic luster, a clearish to whitish color (impure specimens that have inclusions of fine-grained sediments are mottled grayish), a white streak, and is moderately soft - 2.5 on the Mohs Hardness Scale. Locality: unrecorded / undisclosed site in Kern County, southern California, USA Photo gallery of ulexite: www.mindat.org/gallery.php?min=4085 |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/53197347572/ |
| 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@N05/53197347572. It was reviewed on 19 September 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 | 17:25, 19 September 2023 | | 2,053 × 1,771 (2.04 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53197347572/ with UploadWizard |
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