File:Agate nodule ("Lake Superior Agate") (Jo Daviess County, Illinois, USA) 12 (34651139191).jpg
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Summary
[edit]DescriptionAgate nodule ("Lake Superior Agate") (Jo Daviess County, Illinois, USA) 12 (34651139191).jpg |
Agate ("Lake Superior Agate") found in Illinois, USA. "Agate" is a rockhound/collector term for cavities in rocks (usually sedimentary rocks such as limestone or igneous rocks such as basalt) that have been partially or completely filled with irregularly concentric layers of microcrystalline, fibrous quartz (chalcedony - SiO2). Agate is quartz. The above specimen is "Lake Superior Agate", which is the state gemstone of Minnesota. It is a variety that occurs around Lake Superior in Minnesota and the Upper Peninsula of Michigan. The agate filled large vesicles (gas bubbles) in ~1.1 billion year old basalt lava flows of Minnesota's North Shore Volcanic Series and Michigan's Portage Lake Volcanic Series. The reddish-brown coloration seen in this agate sample is the result of iron oxide impurities in the chalcedony layers. This sample was actually near Dubuque, Iowa - way south of Minnesota. Pleistocene glaciers and post-glaciation meltwater rivers transported some agates from the Lake Superior area to deposits along the Mississippi River. Locality: undisclosed site attributed to the Mississippi River in western Jo Daviess County, northwestern Illinois, USA |
Date | |
Source | Agate nodule ("Lake Superior Agate") (Jo Daviess County, Illinois, USA) 12 |
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@N05/34651139191 (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 | 07:14, 10 October 2019 | 2,225 × 1,576 (2.03 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 | 1/60 sec (0.016666666666667) |
F-number | f/10 |
ISO speed rating | 80 |
Date and time of data generation | 11:09, 6 May 2017 |
Lens focal length | 9.681 mm |
Image title | |
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 13.0 (Macintosh) |
File change date and time | 17:27, 20 May 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 11:09, 6 May 2017 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.65625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.625 APEX (f/3.51) |
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 | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 13:27, 20 May 2017 |
Unique ID of original document | 319E36AF82CA68C238E79131CE73E38E |
IIM version | 32,767 |