File:Native silver (Smuggler Mine, Aspen Mining District, Colorado, USA) 1 (17283935251).jpg
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Summary
DescriptionNative silver (Smuggler Mine, Aspen Mining District, Colorado, USA) 1 (17283935251).jpg |
Large native silver mass from Colorado, USA. (vintage photo by S.I. Hallett) 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 Colorado rock shown above is a 1,840 pound mass of native silver that was discovered in 1894 at the Smuggler Mine. It was smelted down for its silver long ago. A 12.5 pound piece that was cut from the rock still exists and is on display at the Denver Museum (see elsewhere in this photo album). The original photo has the following notations: Largest nugget of native silver ever mined Wt. 1840 lbs. Smuggler Mine Aspen Colo. 1894 Ag - 93% fineLocality: Smuggler Mine, Aspen Mining District, Pitkin County, Colorado, USA |
Date | |
Source | Native silver (Smuggler Mine, Aspen Mining District, Colorado, USA) 1 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/17283935251. 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
Items portrayed in this file
depicts
some value
25 October 2012
0.8 second
11.614 millimetre
image/jpeg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 19:29, 6 May 2015 | 1,985 × 2,311 (2.08 MB) | commons>Natuur12 | Transferred from Flickr via Flickr2Commons |
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Metadata
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 4/5 sec (0.8) |
F Number | f/4 |
ISO speed rating | 80 |
Date and time of data generation | 12:41, 25 October 2012 |
Lens focal length | 11.614 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 22:25, 26 April 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 12:41, 25 October 2012 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 0.3125 |
APEX aperture | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 18:25, 26 April 2015 |
Unique ID of original document | C68888A7458A84BB180BF388449FB8CE |