File:Pyrite (Huanzala Mine, Peru) 1.jpg
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[edit]DescriptionPyrite (Huanzala Mine, Peru) 1.jpg |
English: Pyrite from Peru. (SMM DM14826, Seaman Mineral Museum, Michigan Technological University, Houghton, Michigan, USA)
A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 5500 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates. The sulfide minerals contain one or more sulfide anions (S-2). The sulfides are usually considered together with the arsenide minerals, the sulfarsenide minerals, and the telluride minerals. Many sulfides are economically significant, as they occur commonly in ores. The metals that combine with S-2 are mainly Fe, Cu, Ni, Ag, etc. Most sulfides have a metallic luster, are moderately soft, and are noticeably heavy for their size. These minerals will not form in the presence of free oxygen. Under an oxygen-rich atmosphere, sulfide minerals tend to chemically weather to various oxide and hydroxide minerals. Pyrite is a common iron sulfide mineral (FeS2). It’s nickname is “fool's gold”. Pyrite has a metallic luster, brassy gold color (in contrast to the deep rich yellow gold color of true gold - www.flickr.com/photos/jsjgeology/sets/72157651325153769/), dark gray to black streak, is hard (H=6 to 6.5), has no cleavage, and is moderately heavy for its size. It often forms cubic crystals or pyritohedrons (crystals having pentagonal faces). Pyrite is common in many hydrothermal veins, shales, coals, various metamorphic rocks, and massive sulfide deposits. The beautiful crystalline pyrite mass shown above comes from the Huanzala Deposit in the Andes Mountains of Peru. There, several limestone horizons of the Lower Cretaceous Santa Formation have polymetallic mineralization. Origin interpretations vary - some consider this to be a contact metamorphic (metasomatic) deposit - a skarn, formed by the interaction between host limestones and Miocene dikes. Others consider this to be a high-temperature, Cretaceous-aged, volcanic sedimentary ore deposit subjected to Miocene remobilization of minerals. Locality: Huanzala Mine, Huallanca District, Dos de Mayo Province, Huanuco Department, Peru Some geologic info. synthesized from: Crowley et al. (1997) - The Raura-Huanzala Group (mining districts in Peru). Mineralogical Record 28(4). Imai et al. (1985) - Mineralization and paragenesis of the Huanzala Mine, central Peru. Economic Geology 80: 461-478. Soler et al. (1986) - Mineralization and paragenesis of the Huanzala Mine, central Peru - a discussion. Economic Geology 81: 195-196. Photo gallery of pyrite: www.mindat.org/gallery.php?min=3314 |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/18952108619/ |
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@N05/18952108619. It was reviewed on 23 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
23 October 2020
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current | 18:39, 23 October 2020 | ![]() | 2,198 × 1,821 (3.35 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/18952108619/ with UploadWizard |
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Camera manufacturer | NIKON CORPORATION |
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Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/5.6 |
ISO speed rating | 400 |
Date and time of data generation | 08:29, 15 September 2010 |
Lens focal length | 105 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 01:54, 25 June 2015 |
Y and C positioning | Centered |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 08:29, 15 September 2010 |
Meaning of each component |
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File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
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White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 157 mm |
Scene capture type | Standard |
Scene control | None |
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Subject distance range | Unknown |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Serial number of camera | 200638ad |
Date metadata was last modified | 21:54, 24 June 2015 |
Unique ID of original document | 1B0628225A520803C0120AC88DC23897 |