Blaubeuren, Cloppenburg, and Machtenstein—Three recently recognized H‐group chondrite finds in Germany with distinct terrestrial ages and weathering effects

In the last 7 years, three meteorites (Blaubeuren, Cloppenburg, and Machtenstein) found in Germany were identified as chondrites. Two of these rocks had been recovered from impact sites decades ago but not considered to be meteorites. The aim this study is fully characterize Based on compositional data silicates, namely olivine low-Ca pyroxene, fit nicely within H-group ordinary brecciated texture Blaubeuren Cloppenburg (both H4-5) perfectly visible, whereas that Machtenstein, officially classified an H5 chondrite, less obvious was detected described study. Considering chondrites general, are very common rather than exception. bulk rock degree shock S2 for Machtenstein S3 Cloppenburg. All samples show significant features weathering. They have lost their original fusion crust more half (W3) or about (W2-3) metal abundances. oxygen isotope compositions consistent with those other H chondrites; however, values heavily disturbed influenced by terrestrial This supported occurrence rare hydrated iron phosphate mineral vivianite (Fe2+Fe2+2[PO4]2·8H2O), which indicates chondrite weathered a wet environment. ages (~9.2 ka), (~5.4 (~1.8 ka) similar alteration age compared meteorite finds relatively environments. still contain abundant metal, although, noted, indicate substantial weathering typical chondrites, although has slightly modified concentrations, leading general loss Fe, Co, Ni due preferential metals sulfides. As exceptions, Co concentrations shortest age, chemical no enrichments Ba Sr, often observed different groups desert finds.