Observational evidence for composite grains in an AGB outflow - MgS in the extreme carbon star LL PegasiR. Lombaert, B. L. de Vries, A. de Koter, L. Decin, M. Min, K. Smolders, H. Mutschke and L. B. F. M. WatersA&A, 544 (2012) L18DOI: https://doi.org/10.1051/0004-6361/201219782