Compositions of Garnets in Interstellar Dust

Details Compositions of Garnets in Interstellar Dust Compositions of Garnets in Interstellar Dust

Sep 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970natur.227.1121m&link_type=abstract

Nature, Volume 227, Issue 5263, pp. 1121-1123 (1970).

Computer Science

17

Scientific paper

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 Å 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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