Identifying Phosphorus Minerals

1. Precipitation with Ammonium Molybdate. Phosphorus exists in minerals in the from of phosphoric acid in the phosphates. It is best tested for by form in a dilute nitric acid solution of the mineral and adding a few cubic centimeters of this to an excess of ammonium molybdate solution. A canary-yellow precipitate forms slowly at first and comes down best in warm solution.
   1. Precipitation with Ammonium Molybdate. Phosphorus exists in minerals in the from of phosphoric acid in the phosphates. It is best tested for by form in a dilute nitric acid solution of the mineral and adding a few cubic centimeters of this to an excess of ammonium molybdate solution. A canary-yellow precipitate forms slowly at first and comes down best in warm solution.
   2. Flame Test. Many phosphates when heated before the blowpipe give a pale bluish green flame color. This may frequently be obtained better when the mineral has previously been moistened with a drop of concentrated sulfuric acid.

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