File:Native copper in calcite crystals (late Mesoproterozoic mineralization age, 1.05-1.06 Ga; Quincy Mine, Hancock, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 7 (17333055945).jpg
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editDescriptionNative copper in calcite crystals (late Mesoproterozoic mineralization age, 1.05-1.06 Ga; Quincy Mine, Hancock, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 7 (17333055945).jpg |
Native copper (Cu) in calcite crystals on copper from the Precambrian of northern Michigan, USA. (Terry Huizing collection) The bedrock in northern Michigan's Keweenaw Peninsula area with Earth's highest concentration of elemental copper (Cu) in its native state. The copper has been extensively mined, but only one active mine remains (all the easily exploited copper is now mined out). Copper usually occurs in various late Mesoproterozoic-aged basaltic rocks and conglomerates. A beautiful and rare occurrence for native copper in northern Michigan is WITHIN other crystals. The above photo shows transparent to translucent calcite crystals having metallic orange-colored inclusions of native copper. Stratigraphy & age: derived from the upper Portage Lake Volcanic Series, upper Mesoproterozoic (1.093 Ga); copper & calcite mineralization age is late Mesoproterozoic (1.05 to 1.06 Ga). Locality: Quincy Mine, city of Hancock, north of Portage Lake, Keweenaw Peninsula, Houghton County, northwestern Upper Peninsula of Michigan, USA. |
Date | |
Source | Native copper in calcite crystals (late Mesoproterozoic mineralization age, 1.05-1.06 Ga; Quincy Mine, Hancock, Keweenaw Peninsula, Upper Peninsula of Michigan, USA) 7 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/17333055945. It was reviewed on 3 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
3 May 2015
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current | 20:02, 3 May 2015 | 3,841 × 2,907 (3.9 MB) | Natuur12 (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/3.2 |
ISO speed rating | 250 |
Date and time of data generation | 10:13, 3 May 2012 |
Lens focal length | 8.295 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 | 11:49, 1 May 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 10:13, 3 May 2012 |
Meaning of each component |
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APEX shutter speed | 6.3125 |
APEX aperture | 3.34375 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
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Focal plane resolution unit | inches |
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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 | 07:49, 1 May 2015 |
Unique ID of original document | CBC44599B00E9F3CC5A875503F6AE1D0 |
IIM version | 8,259 |