File:Digenite-pyrite, Butte Mining District, Montana.jpg
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Summary
DescriptionDigenite-pyrite, Butte Mining District, Montana.jpg |
Digenite-pyrite hydrothermal vein sample from Montana, USA. (SDSMT 2125, South Dakota School of Mines and Technology Museum of Geology, Rapid City, South Dakota, USA) Very dark blue = digenite Brassy gold = pyrite 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 4900 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. Digenite is a scarce copper sulfide mineral, Cu9S5. It has a metallic luster, dark bluish-gray to blackish color, dark gray streak, and a Mohs hardness of 2.5 to 3. It’s usually massive, but can form pseudocubic crystals. Broken surfaces show conchoidal fracture. Primary digenite occurs in some copper-bearing hydrothermal veins, some intrusive igneous rocks, and in some sulfide exhalative deposits. The digenite sample shown above is from Montana's Butte Mining District. In this area, digenite 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: Butte Mining District, Silver Bow County, southwestern Montana, USA Photo gallery of digenite: www.mindat.org/gallery.php?min=1291 |
Date | |
Source | Digenite-pyrite (latest Cretaceous to earliest Tertiary, 62-66 Ma; Butte Mining District, Montana, USA) |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/17586843154. It was reviewed on 12 June 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
12 June 2015
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19 August 2010
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 04:32, 12 June 2015 | ![]() | 2,192 × 1,578 (2.64 MB) | Tillman | Transferred from Flickr via Flickr2Commons |
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Metadata
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F-number | f/3.6 |
ISO speed rating | 200 |
Date and time of data generation | 11:21, 19 August 2010 |
Lens focal length | 35.7 mm |
Width | 3,648 px |
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Bits per component |
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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 | 17:36, 28 May 2015 |
Y and C positioning | Centered |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 11:21, 19 August 2010 |
Meaning of each component |
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APEX brightness | 0 |
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Color space | sRGB |
Exposure index | 200 |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Custom process |
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White balance | Auto white balance |
Digital zoom ratio | 0 |
Focal length in 35 mm film | 234 mm |
Scene capture type | Standard |
Scene control | High gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Date metadata was last modified | 13:36, 28 May 2015 |
Unique ID of original document | 708522C86A47377483C68E886E488A60 |
IIM version | 12,811 |