File:Agate- & quartz-filled geode 1 (32164187660).jpg
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Summary
[edit]DescriptionAgate- & quartz-filled geode 1 (32164187660).jpg |
Geode with agate and quartz. (cut & polished surface) 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 is almost completely filled. The thinly layered, multicolored material near the margin of the geode is agate. "Agate" is a rockhound/collector term for irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2). Agate is quartz. The opaque whitish layer and adjacent layer near the center are also agate. The glassy gray material that fills most of the geode, plus the very central area, is macrocrystalline quartz. 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. " Photo gallery of quartz: <a href="http://www.mindat.org/gallery.php?min=3337" rel="nofollow">www.mindat.org/gallery.php?min=3337</a> |
Date | |
Source | Agate- & quartz-filled geode 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@N05/32164187660 (archive). It was reviewed on 10 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
10 October 2019
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current | 07:11, 10 October 2019 | 2,962 × 2,764 (4.67 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/3.5 |
ISO speed rating | 250 |
Date and time of data generation | 18:13, 25 February 2013 |
Lens focal length | 9.7 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 18:33, 26 January 2017 |
Y and C positioning | Centered |
Exif version | 2.21 |
Date and time of digitizing | 18:13, 25 February 2013 |
Meaning of each component |
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APEX shutter speed | 6.303780749546 |
APEX aperture | 3.614709851552 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 3.614709851552 APEX (f/3.5) |
Metering mode | Pattern |
Flash | Flash did not fire, auto mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905405405 |
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 | 13:33, 26 January 2017 |
Unique ID of original document | CBAA2DD312DE2FE970AD8616F9FC6390 |