This project was undertaken primarily in order to identify the minerals constituting the ores of Philippine manganese deposits. It started with a set of manganese samples submitted to this laboratory by Mr. C. Ibanez for mineralogical identification. It was later on decided to extend the analysis on other manganese samples which could be obtained from other sources in order to give a concise description of their physical, optical, textural and x-ray characteristics.
This report describes exclusively some of the oxides of manganese - a group of minerals comprising practically all of the country’s mineable manganese deposits.