Virgil Ivor Mann; A spot test for phosphorus in rocks. Journal of Sedimentary Research ; 20 (2): 116–117. doi: https://doi.org/10.1306/D42693B9-2B26-11D7-8648000102C1865D
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Acid ammonium molybdate will react with soluble phosphates to form a yellow precipitate. A technique has been devised which utilizes this principle to identify phosphorus-bearing minerals directly upon a rock surface.
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