File:Spherulitic magnetite (Rudnogorsk Deposit, Angara-Ilim Iron Ore District, Irkutsk Region, Siberia, Russia) 12.jpg
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[edit]DescriptionSpherulitic magnetite (Rudnogorsk Deposit, Angara-Ilim Iron Ore District, Irkutsk Region, Siberia, Russia) 12.jpg |
English: Magnetite is Fe3O4, a moderately common iron oxide mineral and the # 2 iron ore mineral. It has a metallic to submetallic luster, dark gray to black color and streak, a hardness of 6 on the Mohs Hardness Scale, has no cleavage, is moderately heavy for its size, and often forms octahedral crystals. Magnetite is readily identified - a magnet will stick to it, hence the name.
Seen here is a remarkable specimen of spherulitic magnetite from an iron mine at Rudnogorsk, Siberia. "Spherulitic" refers to the oolite-like, concentrically-layered, rounded to subrounded masses. The Rudnogorsk Deposit is part of the Angara-Ilim Iron Ore District, a regional cluster of magnetite-rich, metasomatized breccia pipes of explosive volcanic origin. The occurrence and geometry of magnetite bodies in the pipes is varied and complex. Magnetite mineralization occurred during emplacement of the Siberian Traps - mafic intrusions both predate and cut the breccia pipes. Siberian Traps rocks date to Permian-Triassic boundary times (~251 Ma). The major ore minerals in the district are magnesium-bearing iron oxides: magnomagnetite (MgxFe1-xFe2O4) and magnesioferrite (MgFe2O4). The light-colored material in this rock includes calcite, but 1 or more other nonmetalic minerals are also present. Locality: mine just west of the town of Rudnogorsk, Irkutsk Region, northwest of Lake Baikal, Siberia, Russia Photo gallery of magnetite: www.mindat.org/gallery.php?min=2538 |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/51130303018/ |
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@N05/51130303018. It was reviewed on 26 April 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
26 April 2021
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current | 14:43, 26 April 2021 | 1,832 × 2,300 (3.1 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51130303018/ with UploadWizard |
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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/11 |
ISO speed rating | 80 |
Date and time of data generation | 13:12, 21 April 2021 |
Lens focal length | 11.614 mm |
Width | 4,000 px |
Height | 3,000 px |
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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 18.0 (Macintosh) |
File change date and time | 17:24, 21 April 2021 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 13:12, 21 April 2021 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4 APEX (f/4) |
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 | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 13:24, 21 April 2021 |
Unique ID of original document | EC105F4EB22A1267A1A4FFC85D5CEF27 |