A laser-Raman microprobe study of platinum-group minerals from the Munni Munni layered intrusion, West Pilbara Block, Western Australia
A laser-Raman microprobe study of platinum-group minerals from the Munni Munni layered intrusion, West Pilbara Block, Western Australia (in Microbeam techniques in the earth sciences, Frank C. Hawthorne (editor) and R. F. Martin (editor))
The Canadian Mineralogist (April 1995) 33, Part 2: 409-417
The laser-Raman microprobe has been used to identify relatively small (up to 10 mu m) grains of PGM in the mineralized layer just below the contact between the ultramafic zone and the gabbroic zone of the Archaean Munni Munni layered igneous complex. The Raman spectra of sperrylite, platarsite, moncheite, cooperite, braggite and potarite are reported for the first time, and their spectra are compared with those predicted from group theory. All Raman bands occur below 500 cm (super -1) , and each PGM produces a distinct spectrum, thus allowing ready identification of each mineral. The technique requires little preparation of the sample and offers the advantage of high spatial resolution and relatively rapid identification of in situ mu m-sized grains of PGM in silicate or sulphide matrices.