Samples were made into thin sections with polished surface. Each spectrum was measure by 10 loops with each one collected for 15 seconds.
Measurement name: Raman spectroscopyInstrument: Horiba Jobin-Yvon S.A.S. T64000 triple-monochromator spectrometer equipped with an Olympus BX41 confocal microscope and a liquid-nitrogen-cooled Symphony charge-coupled device (CCD) detectorPlace: Mineralogisch-Petrographisches Institut, Universität HamburgConditions: λ = 514.532 nm, objective lens 50×, confocal hole 500 μm and laser spot of 1 μm.