File:Enargite (latest Cretaceous to earliest Tertiary, 62-66 Ma; Leonard Mine, Butte, Montana, USA) 3 (18925663652).jpg
Original file (2,224 × 1,490 pixels, file size: 2.75 MB, MIME type: image/jpeg)
Captions
Summary
[edit]DescriptionEnargite (latest Cretaceous to earliest Tertiary, 62-66 Ma; Leonard Mine, Butte, Montana, USA) 3 (18925663652).jpg |
Enargite 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 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. Enargite is a scarce copper arsenosulfide mineral, Cu3AsS4. It has a metallic luster, dark gray to black color and streak, and a Mohs hardness of 3. This mineral often occurs in a massive or granular form, or in radiating masses. It can form tabular or prismatic or blocky crystals having a pseudohexagonal cross-section. Some crystal faces can have striations. Enargite breaks along several planes of cleavage and also breaks along irregular fracture surfaces. It usually occurs in copper sulfide-bearing hydrothermal veins. It has been mined as an ore mineral of copper, but the arsenic is a "penalty element". Extra money has to be spent during ore processing to remove the arsenic. The enargite sample shown above is from Butte, Montana. Enargite is one of the three most important copper-bearing ore minerals in the Central Zone of the Butte Mining District. For many decades, Butte was the # 1 producer of copper on Earth. Enargite at Butte occurs in copper sulfide-rich hydrothermal veins (dating to ~62-66 million years) 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 enargite: www.mindat.org/gallery.php?min=1380 |
Date | |
Source | Enargite (latest Cretaceous to earliest Tertiary, 62-66 Ma; Leonard Mine, Butte, Montana, USA) 3 |
Author | James St. John |
Licensing
[edit]- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by jsj1771 at https://flickr.com/photos/47445767@N05/18925663652. It was reviewed on 27 July 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
27 July 2015
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 18:42, 27 July 2015 | 2,224 × 1,490 (2.75 MB) | Natuur12 (talk | contribs) | Transferred from Flickr via Flickr2Commons |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
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 |
---|---|
Camera model | KODAK EASYSHARE Z1012 IS Digital Camera |
Exposure time | 1/40 sec (0.025) |
F-number | f/3.2 |
ISO speed rating | 100 |
Date and time of data generation | 11:01, 9 August 2010 |
Lens focal length | 11.7 mm |
Width | 3,648 px |
Height | 2,736 px |
Bits per component |
|
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 | 14:43, 18 June 2015 |
Y and C positioning | Centered |
Exposure Program | Normal program |
Exif version | 2.21 |
Date and time of digitizing | 11:01, 9 August 2010 |
Meaning of each component |
|
APEX shutter speed | 5.3333333333333 |
APEX aperture | 3.4 |
APEX brightness | 0 |
APEX exposure bias | 0 |
Maximum land aperture | 3.4 APEX (f/3.25) |
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 | 100 |
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 | 57 mm |
Scene capture type | Standard |
Scene control | Low gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Unique ID of original document | 8950B6195D9BF20541C3834BB46F67A9 |
Date metadata was last modified | 10:43, 18 June 2015 |
Keywords | Butte Montana day 1 and 2 |