----------------------------------- renclod 15 Mar 2026 16:25 ----------------------------------- M-17 a fost trimis la Nomenclature Commitee pentru aprobare (numele provizoriu este NWA 18481): Status of job 20260305175319 Dear submitter, Here is the current status of samples you submitted to the Nomenclature Committee for job 20260305175319 (NWAHowardite_Dumitru): The following meteorites are still pending before the committee: Northwest Africa 18481 (799 g, Howardite) Dr. Chris Herd mi-a trimis si continutul, citez cateva extrase: FOR THE WRITEUP howardite (B. Hassen and C. Herd, UAb) Optical and microprobe examination of a polished thin section shows a highly fragmented breccia containing a variety of lithic and mineral clasts up to 3 mm across. Lithic clasts include mm-scale pigeonite-plagioclase-silica and orthopyroxene-chromite assemblages, consistent in mineral composition with eucrite and diogenite lithologies, respectively. Mineral clasts include augite and pigeonite with fine exsolution lamellae, plagioclase, ilmenite and silica. Shock effects include plagioclase partially converted to maskelynite and mosaicism in pyroxene. There is no obvious terrestrial alteration. (C. Herd, B. Hassen, and A. Locock, UAb) Data obtained by EMP examination of carbon-coated thin section: opx Fs32±9 Wo2.3±0.8, FeO/MnO=31±3 (n=28 ), pigeonite Fs48±8 Wo9.1±2.6, FeO/MnO=31±2 (n=16), augite Fs25±2 Wo40±2, FeO/MnO=30±3 (n=2),plagioclase Ab10±6 An89±7, Or 0.5±0.7, range An72-95 (n=16). https://photos.app.goo.gl/4aXnRQAuH8nv11Cp7 https://photos.app.goo.gl/mkhhNJ47FDUgCkQg6 https://photos.app.goo.gl/v9hZLCTyJF1jGwgg7 https://photos.app.goo.gl/EPok7UANGquJ13j26 Exista doua tipuri de Howardite. Fragmental breccia si regolith breccia. Diferenta se decide in functie de continutul in izotopii gazelor nobile implantate de vantul solar, comparat cu izotopii produsi de radiatia cosmica (gaze nobile planetare). Meteoritii Howardite regolith breccia sunt caracterizati si de raportul continutului de material eucritic si diogenitic, 2/3 eucritic si 1/3 diogenitic, o determinare statistica: https://onlinelibrary.wiley.com/doi/10.1111/maps.12182 https://ntrs.nasa.gov/api/citations/20120001855/downloads/20120001855.pdf iar M-17 se incadreaza perfect in acest raport de 2:1 - plus ca este "highly fragmented breccia" , cum se vede si din ultimul link din photo albumul google (mai sus). Tot acest comentariu (plictisitor ?!) are ca scop sa arate determinarea mea de a continua analiza meteoritului M-17 (NWA 18481) pana cand aflu daca este regolithic sau fragmental. Nu stiu cum. O sa-i propun Dr.Chris Herd, sa vad daca este interesat. Sau pe alta cale. Dictionar ;) Ab albite An anorthite EMP electron micro probe Fs ferrosilite Opx orthopyroxene Or orthoclase Wo wollastonite