TY - JOUR T1 - On the Existence of Phosphoric Acid in Rocks of Igneous origin. JF - Abstracts of the Papers Communicated to the Royal Society of London (1843-1854) VL - 5 SP - 508 EP - 509 PY - 1843/01/01/ UR - http://dx.doi.org/10.1098/rspl.1843.0017 M3 - doi:10.1098/rspl.1843.0017 AU - Fownes, G. ER -