File:Native silver (Smuggler Mine, Aspen Mining District, Colorado, USA) 3 (17098186629).jpg
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DescriptionNative silver (Smuggler Mine, Aspen Mining District, Colorado, USA) 3 (17098186629).jpg |
Native silver from Colorado, USA. (public display, Denver Museum of Nature & Science, Denver, Colorado, USA) 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. The Smuggler Mine, Colorado rock shown above is a 12.5 pound mass of native silver that was cut from a much larger mass that originally weighed 1,840 pounds. This huge silver "nugget" was found in 1894. Locality: Smuggler Mine, Aspen Mining District, Pitkin County, Colorado, USA |
Date | |
Source | Native silver (Smuggler Mine, Aspen Mining District, Colorado, USA) 3 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/17098186629. 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
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current | 19:29, 6 May 2015 | 3,920 × 2,611 (3.65 MB) | Natuur12 (talk | contribs) | Transferred from Flickr via Flickr2Commons |
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Date and time of data generation | 13:48, 26 October 2013 |
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Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 314 dpi |
Vertical resolution | 314 dpi |
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File change date and time | 22:31, 26 April 2015 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.3 |
Date and time of digitizing | 13:48, 26 October 2013 |
Meaning of each component |
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Flash | Flash did not fire, compulsory flash suppression |
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Color space | sRGB |
File source | Digital still camera |
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Exposure mode | Manual exposure |
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Digital zoom ratio | 1.44 |
Focal length in 35 mm film | 100 mm |
Scene capture type | Standard |
Scene control | High gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Receiver status | Measurement interoperability |
Reference for direction of image | Magnetic direction |
Direction of image | 357 |
GPS tag version | 0.0.3.2 |
Serial number of camera | BCA539215 |
Date metadata was last modified | 18:31, 26 April 2015 |
Unique ID of original document | 42E29244CF4FED0BB0B860045964D4E2 |