Impact Diamonds in an Extravagant Metal Piece Found in Paraguay: Published Raman spectra revisited
DOI:
https://doi.org/10.32480/rscp.2024.29.1.22Keywords:
largest lonsdaleitic diamond-bearing iron meteorite, ParaguayAbstract
Very probable lonsdaleitic diamond bearing a pitcher-shaped metal piece weighing approximately 303 kg. published Raman spectra we revisited. The Raman spectra of diamond characteristically show 3 intense bands: I- D-band with shifted peaks wavenumber (1294 to 1330 cm-1) I.e., diamond crystals that have lonsdaleitic component nature. II- G-Band (with peaks wavenumber in 1583 to 1588 cm-1), I.e., very probable diamond crystals formation by a shock-induced transformation of graphite present in the metal piece. III- iron-meteorite band (with peaks wavenumber in 217, 284, and 402 cm-1) I.e., they were formed in an iron meteorite environment. IV- between D-band and G-band identify the 4th band, which is not very intense (peaks wavenumber in 1428 to 1460 cm-1), which is now in typical of low-quality diamonds or disordered diamonds. In the diamond, we fain that FWHM values (39 to 162 cm-1) are large to very large like is found in lonsdaleitic diamonds. FWHM values project to the diamonds between 10 to probable 100% of lonsdaleitic component. Shifted D-peak wavenumber and FWHM values suggest the lonsdaleitic diamond's formation in conditions of super high pressure and high temperatures (Formation temperature 1068°-1541°C) that would have been given by a collision between fireballs in space. So, the METCCH joins to the rare diamonds-bearing iron meteorites so far recorded yet; and could be seen as the largest diamond-bearing iron meteorite ever recorded.
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