Astromat

These data include the results of TEM analyses on sample OREX-800045-102 nanoparticles which were dispersed on a TEM mesh grid. The focus of these analyses were Na,Ca carbonates featured in the Singerling et al. GCA paper, including grains 4, 11, 22, and 27. Some of the associated data was previously uploaded in bundle 20240710_TEM_GU_OREX-800045-102_1. The grains most closely match gaylussite or pirssonite and are consistent with formation at low temperature in Na-rich fluids. The grains were electron-beam sensitive and amorphized rapidly. This study represents the first detailed discussion of these phases.