Abstract
ABSTRACT Merrillite and apatite crystals from four historical Mexican chondrites were studied by Environmental Scanning Electron Microscopy (ESEM), Energy Dispersive Spectrometry (EDS), Back-scattering (BS), Spectra cathodoluminescence (CL), and Micro-Raman Spectroscopy (MRS). CL is a powerful technique for exciting light emission from intrinsic relaxations, impurities, and imperfections in the outer few microns of the surface of minerals. The spectra CL patterns of the analyzed extraterrestrial calcium phosphates in Mexican chondrites are similar to each other and different from other terrestrial analogues, pointing to analogous genetic planetary histories and comparable compositions. The extraterrestrial merrillites show spectra CL similar to the terrestrial mineral monazite-(Ce) found in Spanish slates. The extraterrestrial genetic conditions of Ca-phosphates provide special chemical impurities such as aluminum and sodium presence in the Ca-phosphate structures producing spectra CL similar to the structural region, that is, the UV-blue emission similar to those observed in the sodium-aluminum phosphate brazilianite.
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