Image:SilverOreUSGOV.jpg
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This is a file from the Wikimedia Commons. The description on its description page there is shown below. |
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This image has currency in it to indicate scale. The coin depicted has a diameter of 19 millimetres (0.75 in) . Using objects such as coins for scale is discouraged, as they will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins are particularly bad as they can reinforce a geographical bias, and some coins' designs are not free content. If possible, upload a photograph of the subject using ruler for scale ( example) or add a scale marking via an image editor instead ( example). SI/metric units are the most commonly used worldwide (see metre, 1 E-2 m).
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Silver ore. Penny is shown for scale.
Source: http://resourcescommittee.house.gov/subcommittees/emr/usgsweb/photogallery/ ; English Wikipedia, original upload 3 August 2004 by Chris 73
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This image is a work of the "Minerals in Your World" project, a cooperative effort between the United States Geological Survey and the Mineral Information Institute. The images were featured in the "Minerals and Materials Photo Gallery" on the website of the U.S House Subcommittee on Energy and Natural Resources. As a work of the U.S. federal government, the image is in the public domain. |
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This image has currency in it to indicate scale. Avoid using objects such as coins for scale, as they will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins are particularly bad as they can reinforce a geographical bias, and some coins' designs are not free content. Ideally, a photograph should include a ruler with the subject (as seen in this photo) or add a scale marking via an image editor instead (as seen in this photo). SI/metric units are the most commonly used worldwide (see metre, 1 E-2 m). Examples of bad practice: here. |
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Common coin diameters for reference:
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File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Dimensions | User | Comment | |
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| current | 06:32, 15 September 2005 | 600×450 (91 KB) | Saperaud | (Silver ore. Source: http://resourcescommittee.house.gov/subcommittees/emr/usgsweb/photogallery/ ; English Wikipedia, original upload 3 August 2004 by Chris 73 en:Image:{{subst:PAGENAME}} {{PD-USGov-Interior-USGS-Minerals}} [[Ca) |
