Image:MercuryOreUSGOV.jpg

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MercuryOreUSGOV.jpg‎ (600 × 451 pixel, file size: 64 KB, MIME type: image/jpeg)

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This image has a coin in it to indicate scale.

Do not use object 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.

Please photograph a ruler with the subject or add a scale marking via an image editor instead. SI/metric units are the most commonly used worldwide (see metre, 1 E-2 m).

Examples of good practice: with (metric & imperial) ruler and with superimposed line.
Examples of bad practice: here.

Common coin diameters for reference:

U.S. and Canada:
- 1¢: 19 mm, 0.75 in;
- 5¢: 20 mm, 0.79 in;
- 10¢: 18 mm, 0.71 in;
- 25¢: 24 mm, 0.95 in;
- 50¢: 30 mm, 1.18 in;
- $1: 26 mm, 1.02 in;
- $2: 28 mm, 1.10 in.

UK
- 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.

Eur
- 1¢: 16.25 mm,
- 2¢: 18.75 mm,
- 5¢: 21.25 mm,
- 10¢: 19.75 mm,
- 20¢: 22.25 mm,
- 50¢: 24.25 mm,
- 1€: 23.25 mm,
- 2€: 25.75 mm,

[edit] Summary

Ore of Mercury.

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.

From USGS Web

Source: English Wikipedia, original upload 3 August 2004 by Chris 73

[edit] Licensing

This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright.

Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision.