File:Agate-filled geode (Brazil) 1 (31912507804).jpg
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Summary
[edit]DescriptionAgate-filled geode (Brazil) 1 (31912507804).jpg |
Agate from Brazil. (public display, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA) "Agate" is a rockhound/collector term for irregularly- & concentrically-layered masses of microcrystalline quartz. Individual layers consist of translucent or opaque, microcrystalline, fibrous quartz called chalcedony. Impurities in different layers cause variations in color. Many agate masses are simply geodes that have completely filled up with quartz. Common agate colors are clearish-whitish-grayish, brownish-red, and yellowish-brown. Commercial agates that occur in greens and blues and purples are almost always dyed (faked). The whitish-gray, glassy material at the center of this specimen is macrocrystalline quartz. |
Date | |
Source | Agate-filled geode (Brazil) 1 |
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@N05/31912507804 (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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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 07:12, 10 October 2019 | ![]() | 2,047 × 1,912 (1.79 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/5 |
Date and time of data generation | 14:20, 7 March 2009 |
Lens focal length | 70 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 21:31, 30 October 2014 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 14:20, 7 March 2009 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 4.6 APEX (f/4.92) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, strobe return light detected, auto mode |
DateTime subseconds | 10 |
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DateTimeDigitized subseconds | 10 |
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Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
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Focal length in 35 mm film | 105 mm |
Scene capture type | Standard |
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Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 2,047 px |
Image height | 1,912 px |
Date metadata was last modified | 17:31, 30 October 2014 |