File:Silver (Paleoproterozoic, 2.217 Ga; McKinley-Darragh Mine, Cobalt Mining District, Ontario, Canada) (17270246141).jpg
![File:Silver (Paleoproterozoic, 2.217 Ga; McKinley-Darragh Mine, Cobalt Mining District, Ontario, Canada) (17270246141).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/6b/Silver_%28Paleoproterozoic%2C_2.217_Ga%3B_McKinley-Darragh_Mine%2C_Cobalt_Mining_District%2C_Ontario%2C_Canada%29_%2817270246141%29.jpg/800px-Silver_%28Paleoproterozoic%2C_2.217_Ga%3B_McKinley-Darragh_Mine%2C_Cobalt_Mining_District%2C_Ontario%2C_Canada%29_%2817270246141%29.jpg?20150506192853)
Original file (903 × 661 pixels, file size: 1.02 MB, MIME type: image/jpeg)
Captions
Captions
Summary
[edit]DescriptionSilver (Paleoproterozoic, 2.217 Ga; McKinley-Darragh Mine, Cobalt Mining District, Ontario, Canada) (17270246141).jpg |
Native silver from the Precambrian of Ontario, Canada. (3.0 cm across at its widest) A mineral is a naturally-occurring, solid, inorganic, crystalline substrance 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. Elements are fundamental substances of matter - matter that is composed of the same types of atoms. At present, 118 elements are known (four of them are still unnamed). Of these, 98 occur naturally on Earth (hydrogen to californium). Most of these occur in rocks & minerals, although some occur in very small, trace amounts. Only some elements occur in their native elemental state as minerals. To find a native element in nature, it must be relatively non-reactive and there must be some concentration process. Metallic, semimetallic (metalloid), and nonmetallic elements are known in their native state as minerals. Silver is part of the gold-group of metallic elements. Silver is a precious metal, but is far less valuable than gold or platinum. Silver usually occurs as a silver sulfide mineral, but it also occurs in nature in its native state, often in the form of twisted wires. Silver is moderately soft and has a silvery-white color on fresh surfaces that tarnishes to darker colors. Elemental silver in nature is often found alloyed with other metals. Naturally alloyed gold-silver is called electrum. Shown above is a native silver mass from Ontario's McKinley-Darragh Mine. Native silver at this mine occurs in near-vertical hydrothermal veins consisting of silver+cobalt-arsenides/sulfosalts+carbonate. The veins cut through conglomerates, sandstones, and siltstones of the Coleman Member, Gowganda Formation (Paleoproterozoic, 2.288 b.y.). Published literature on the Cobalt Mining District has shown that the hydrothermal veins intruded through their host rocks at about 2.217 billion years (~mid-Paleoproterozoic). Hydrothermal vein mineralization appears to have been generated by, or related to, intrusion of the Nipissing Diabase Sill, a widespread, 300 meter thick unit in this area. Locality: McKinley-Darragh Mine, southern side of Cobalt Lake, Cobalt Mining District, southeastern Timiskaming District, southeatern Ontario, southeastern Canada |
Date | |
Source | Silver (Paleoproterozoic, 2.217 Ga; McKinley-Darragh Mine, Cobalt Mining District, Ontario, Canada) |
Author | James St. John |
Licensing
[edit]![w:en:Creative Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/CC_some_rights_reserved.svg/90px-CC_some_rights_reserved.svg.png)
![attribution](https://upload.wikimedia.org/wikipedia/commons/thumb/1/11/Cc-by_new_white.svg/24px-Cc-by_new_white.svg.png)
- 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://www.flickr.com/photos/47445767@N05/17270246141. It was reviewed on 6 May 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
6 May 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 | 19:28, 6 May 2015 | ![]() | 903 × 661 (1.02 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.
Width | 904 px |
---|---|
Height | 702 px |
Bits per component |
|
Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 750 dpi |
Vertical resolution | 750 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 21:04, 25 April 2015 |
Exif version | 2.21 |
Color space | sRGB |
Unique ID of original document | 32AEC31A41CD2C4DB1DBE8B227829149 |
Date and time of digitizing | 17:02, 25 April 2015 |
Date metadata was last modified | 17:04, 25 April 2015 |