Image:GoldOreUSGOV.jpg

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This is a file from the Wikimedia Commons. The description on its description page there is shown below. Commons is a freely licensed media file repository. You can help.

This image has currency in it to indicate scale. Please add the size of the coin to this template: For example, {{NoCoins | {{convert|19|mm|in}} }} for a US or Canadian one-cent coin.

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).

Common coin diameters for reference:
U.S. dollar: 1¢: 19 mm, 0.75 in; 5¢: 21 mm, 0.84 in; 10¢: 18 mm, 0.71 in; 25¢: 24 mm, 0.96 in; 50¢: 31 mm, 1.21 in; $1: 26.5 mm, 1.04 in.	Canadian dollar: 1¢: 19 mm, 0.75 in; 5¢: 21 mm, 0.83 in; 10¢: 18 mm, 0.71 in; 25¢: 24 mm, 0.94 in; 50¢: 27 mm, 1.07 in; $1: 26.5 mm, 1.04 in; $2: 28 mm, 1.10 in.	Pound sterling: 1p: 20.32 mm, 0.80 in; 2p: 25.91 mm, 1.02 in; 5p: 18.00 mm, 0.71 in; 10p: 24.50 mm, 0.96 in; 20p: 21.40 mm, 0.84 in; 50p: 27.30 mm, 1.07 in; £1: 22.50 mm, 0.89 in; £2: 28.40 mm, 1.12 in.	Euro: 1c: 16.25 mm, 0.64 in; 2c: 18.75 mm, 0.74 in; 5c: 21.25 mm, 0.84 in; 10c: 19.75 mm, 0.78 in; 20c: 22.25 mm, 0.88 in; 50c: 24.25 mm, 0.95 in; €1: 23.25 mm, 0.92 in; €2: 25.75 mm, 1.01 in.

Gold ore.

This image is in the public domain because it contains materials that originally came from the United States Geological Survey, an agency of the United States Department of Interior. For more information, see the official USGS copyright policy