Abstract

HUFFMAN1 has shown that absorption bands in the optical spectra of the supernova in NGC 4496 correlate well with d–d bands of Fe3+ in yttrium iron garnet and Fe2+ in terrestrial almandine, Fe2+3 Al3+2Si3O12. I have suggested2 that the 4430 A band in supernova spectra is a result of Fe3+ in a silicate matrix, the band being reminiscent of that marking the 6A1(S)→4A14E(G) transition in octahedral Fe3+ in andradite garnet, Ca2+3Fe3+2Si3O12. It is likely that interstellar garnets are silicate-based, and here I propose approximate formulae for these garnets based on the identification of two interstellar absorption bands, the energies of which can be related to garnet compositions.

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