File:Gypsum-cemented sand (possibly Mexico) 3.jpg
![File:Gypsum-cemented sand (possibly Mexico) 3.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/28/Gypsum-cemented_sand_%28possibly_Mexico%29_3.jpg/800px-Gypsum-cemented_sand_%28possibly_Mexico%29_3.jpg?20240326202012)
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Summary
[edit]DescriptionGypsum-cemented sand (possibly Mexico) 3.jpg |
English: (~4.7 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@N05/53529380753/ |
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@N05/53529380753. 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. |
26 March 2024
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current | 20:20, 26 March 2024 | ![]() | 2,236 × 1,631 (2.83 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/53529380753/ with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/11 |
ISO speed rating | 80 |
Date and time of data generation | 17:05, 9 February 2024 |
Lens focal length | 11.614 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 20.0 (Macintosh) |
File change date and time | 12:55, 14 February 2024 |
Exif version | 2.21 |
Date and time of digitizing | 17:05, 9 February 2024 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 07:55, 14 February 2024 |
Unique ID of original document | 8305C94A453CA983FABF8DB385E0A379 |
IIM version | 2 |