Specialist laboratories employ a range of tests to identify meteorites, ensuring accurate classification and analysis. Initially, visual inspection is conducted to assess features like fusion crust and regmaglypts. Laboratories then perform density and magnetic susceptibility tests, as meteorites often have higher densities and magnetic properties compared to terrestrial rocks.
Mineralogical analysis is crucial, often using X-ray diffraction (XRD) to determine the mineral composition. Scanning electron microscopy (SEM) provides detailed imagery of the meteorite's surface and internal structure, revealing unique textures and mineral phases. Energy-dispersive X-ray spectroscopy (EDS) is used alongside SEM to analyze elemental composition.
Isotopic analysis, particularly of oxygen isotopes, helps differentiate meteorites from Earth rocks, as meteorites have distinct isotopic signatures. Laboratories also conduct mass spectrometry, such as inductively coupled plasma mass spectrometry (ICP-MS), to measure trace elements and isotopic ratios, providing insights into the meteorite's origin and age.
Petrographic microscopy is employed to examine thin sections of the meteorite, identifying mineral assemblages and textures. This helps classify the meteorite into groups like chondrites or achondrites. Raman spectroscopy is another tool used to identify carbonaceous materials and other minerals.
Thermoluminescence testing can determine the thermal history of the meteorite, while Mössbauer spectroscopy is used to study iron-bearing minerals. Laboratories may also perform noble gas analysis to understand cosmic ray exposure ages.
These tests, grounded in academic research and industry standards, ensure comprehensive meteorite identification and classification, contributing to our understanding of planetary formation and the solar system's history.
