File:Geode with aragonite (Bloomington, Indiana, USA) 1 (32574234506).jpg
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Summary
[edit]DescriptionGeode with aragonite (Bloomington, Indiana, USA) 1 (32574234506).jpg |
Geode from Indiana, USA. (Ann Richardson collection) Shown above is the interior of a geode. Geodes are small to large, subspherical to irregularly-shaped, crystal-lined cavities in rocks. They form when water enters a void in a host rock and precipitates crystals. The most common geode-lining mineral is quartz. This geode has whitish-colored aragonite (CaCO3 - calcium carbonate). Geode info. from the Field Museum of Natural History (Chicago, Illinois, USA): "Geodes are hollow, subspherical bodies, ranging from an inch or two to a foot or more in diameter. Most geodes occur in limestones, rarely in shales. They have an outer chalcedonic silica layer which is separated from the enclosing limestone matrix by a thin clay film. The inner surface of the chalcedonic layer is usually lined with inward projecting quartz crystals, though in many geodes drusy coatings of calcite and dolomite occur commonly. Of less common occurrence, are crystals of magnetite, pyrite, sphalerite, and a few other such minor and rarer constituents. The mode of origin of geodes in sedimentary rocks is but imperfectly understood. That geodes originate in an initial cavity, such as the unfilled space within a fossil, is well recognized, but whether such a cavity is a necessary prerequisite is open to question; geodes may originate in cavities formed by solution. Many geodes show evidence of expansion, apparently resulting from pressure. A notable example of this singular phenomenon of expansion of the growing geodes is the "exploding bomb" structure. " Locality: unrecorded/undisclosed site at or near Bloomington, Monroe County, southern Indiana, USA |
Date | |
Source | Geode with aragonite (Bloomington, Indiana, USA) 1 |
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@N05/32574234506 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
7 December 2019
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current | 18:42, 7 December 2019 | 3,260 × 2,208 (4.55 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/80 sec (0.0125) |
F-number | f/4.5 |
ISO speed rating | 320 |
Date and time of data generation | 10:22, 3 May 2012 |
Lens focal length | 14.303 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 13:35, 30 January 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 10:22, 3 May 2012 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 6.3125 |
APEX aperture | 4.34375 |
APEX exposure bias | 0 |
Maximum land aperture | 4.34375 APEX (f/4.51) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
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Focal plane resolution unit | inches |
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File source | Digital still camera |
Custom image processing | Normal process |
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White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Supported Flashpix version | 1 |
Image width | 3,260 px |
Image height | 2,208 px |
Date metadata was last modified | 08:35, 30 January 2017 |
IIM version | 2 |