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Summary
phosphate rock, which formed in oceans in the form of calcium phosphate called phosphorite. It is deposited in thin layers that cover thousands of square kilometers. The primary mineral in phosphate rock is apatite.
Copyright status
This image is public domain because it was published by the U.S. House of Representatives Committee on Resources.
Source
http://resourcescommittee.house.gov/subcommittees/emr/usgsweb/materials/phosphate.html
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment |
current | 21:59, 15 November 2006 |  | 360 × 270 (24 KB) | Jiiwon | phosphate rock |
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