File:Gypsum (Willow Creek, Alberta, Canada) (32090435452).jpg
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Summary
[edit]DescriptionGypsum (Willow Creek, Alberta, Canada) (32090435452).jpg |
Gypsum crystal from Canada. (3.9 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 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 (see example above). Gypsum has economic value as a mineral. It is the starting ingredient for making plaster and wallboard. Locality: Willow Creek, near the town of Nanton, Alberta, Canada Photo gallery of gypsum: <a href="http://www.mindat.org/gallery.php?min=1784" rel="noreferrer nofollow">www.mindat.org/gallery.php?min=1784</a> |
Date | |
Source | Gypsum (Willow Creek, Alberta, Canada) |
Author | James St. John |
Licensing
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/32090435452 (archive). It was reviewed on 12 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
12 December 2019
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 13:13, 12 December 2019 | 1,320 × 787 (1.32 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Metadata
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Width | 1,320 px |
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Height | 787 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 800 dpi |
Vertical resolution | 800 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 21:21, 10 January 2017 |
Exif version | 2.21 |
Color space | sRGB |
Unique ID of original document | 55D36B85B065B500A2429142AA515F6D |
Date and time of digitizing | 16:18, 10 January 2017 |
Date metadata was last modified | 16:21, 10 January 2017 |