File:Americana 1920 Mineralogy - Valuable Minerals.jpg
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Summary
A color chart showing ten minerals corresponding to the raw forms of commercially valuable metals, as well as a sample of coal and iron pyrite.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 01:48, 5 January 2017 | | 1,415 × 2,127 (385 KB) | 127.0.0.1 (talk) | A color chart showing ten minerals corresponding to the raw forms of commercially valuable metals, as well as a sample of coal and iron pyrite. |
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