File:Covellite (latest Cretaceous to earliest Tertiary, 62-66 Ma; Leonard Mine, Butte, Montana, USA) 4.jpg
Original file (2,405 × 1,609 pixels, file size: 2.77 MB, MIME type: image/jpeg)
Captions
Summary
editDescriptionCovellite (latest Cretaceous to earliest Tertiary, 62-66 Ma; Leonard Mine, Butte, Montana, USA) 4.jpg |
English: Covellite from Montana, USA. (public display, Montana Bureau of Mines and Geology Mineral Museum, Butte, Montana, 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 5600 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. Covellite is an attractive, deep metallic blue mineral having the formula CuS - copper sulfide. It's principally a secondary sulfide mineral, formed by the breakdown of pre-existing copper-bearing sulfides, but also occurs in a massive or crystalline form as a primary mineral. Covellite has a metallic luster, an intensely deep blue or purplish blue color, a dark gray streak, and is quite soft (H = 1.5 to 2). Well-formed crystals are hexagonal plates with a somewhat micaceous appearance. The covellite sample shown above is from Montana's Butte Mining District. In this area, covellite occurs in 62 to 66 million year old copper sulfide-rich hydrothermal veins that intrude the Butte Quartz Monzonite, a pluton of the Boulder Batholith (mid-Campanian Stage, late Late Cretaceous, 76 million years). Locality: Leonard Mine, Butte Mining District, Silver Bow County, southwestern Montana, USA Photo gallery of covellite: www.mindat.org/gallery.php?min=1144 |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/18678450289/ |
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@N05/18678450289. It was reviewed on 2 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 November 2020
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 17:15, 2 November 2020 | 2,405 × 1,609 (2.77 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/18678450289/ with UploadWizard |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | EASTMAN KODAK COMPANY |
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Camera model | KODAK EASYSHARE Z1012 IS Digital Camera |
Exposure time | 1/125 sec (0.008) |
F-number | f/3.6 |
ISO speed rating | 64 |
Date and time of data generation | 14:40, 12 August 2010 |
Lens focal length | 39.8 mm |
Width | 3,648 px |
Height | 2,736 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 480 dpi |
Vertical resolution | 480 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 12:25, 16 June 2015 |
Y and C positioning | Centered |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 14:40, 12 August 2010 |
Meaning of each component |
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APEX shutter speed | 7 |
APEX aperture | 3.7 |
APEX brightness | 1 |
APEX exposure bias | 0 |
Maximum land aperture | 3.7 APEX (f/3.61) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, auto mode |
DateTimeOriginal subseconds | 68 |
Supported Flashpix version | 1 |
Color space | sRGB |
Exposure index | 64 |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Custom process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 254 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Date metadata was last modified | 08:25, 16 June 2015 |
Unique ID of original document | A97E3E3BC268B9E02AA4AA6572C59336 |