Stardust Interstellar Preliminary Examination VIII: Identification of crystalline material in two interstellar candidates
Article first published online: 16 OCT 2013
Published 2014. This article is a U.S. Government work and is in the public domain in the USA.
Meteoritics & Planetary Science
Special Issue: Stardust-Interstellar Dust Special Issue or Stardust Special Issue
Volume 49, Issue 9, pages 1645–1665, September 2014
How to Cite
Gainsforth, Z., Brenker, F. E., Simionovici, A. S., Schmitz, S., Burghammer, M., Butterworth, A. L., Cloetens, P., Lemelle, L., Tresserras, J.-A. S., Schoonjans, T., Silversmit, G., Solé, V. A., Vekemans, B., Vincze, L., Westphal, A. J., Allen, C., Anderson, D., Ansari, A., Bajt, S., Bastien, R. K., Bassim, N., Bechtel, H. A., Borg, J., Bridges, J., Brownlee, D. E., Burchell, M., Changela, H., Davis, A. M., Doll, R., Floss, C., Flynn, G., Fougeray, P., Frank, D., Grün, E., Heck, P. R., Hillier, J. K., Hoppe, P., Hudson, B., Huth, J., Hvide, B., Kearsley, A., King, A. J., Lai, B., Leitner, J., Leroux, H., Leonard, A., Lettieri, R., Marchant, W., Nittler, L. R., Ogliore, R., Ong, W. J., Postberg, F., Price, M. C., Sandford, S. A., Srama, R., Stephan, T., Sterken, V., Stodolna, J., Stroud, R. M., Sutton, S., Trieloff, M., Tsou, P., Tsuchiyama, A., Tyliszczak, T., Von Korff, J., Zevin, D., Zolensky, M. E. and >30,000 Stardust@home dusters (2014), Stardust Interstellar Preliminary Examination VIII: Identification of crystalline material in two interstellar candidates. Meteoritics & Planetary Science, 49: 1645–1665. doi: 10.1111/maps.12148
- Issue published online: 9 SEP 2014
- Article first published online: 16 OCT 2013
- Manuscript Accepted: 21 MAY 2013
- Manuscript Received: 4 DEC 2012
- NASA. Grant Number: NNX09AC36G
- Office of Science, Office of Basic Energy Sciences, U.S. Department of Energy. Grant Number: DE-AC02-05CH11231
Using synchrotron-based X-ray diffraction measurements, we identified crystalline material in two particles of extraterrestrial origin extracted from the Stardust Interstellar Dust Collector. The first particle, I1047,1,34 (Hylabrook), consisted of a mosaiced olivine grain approximately 1 µm in size with internal strain fields up to 0.3%. The unit cell dimensions were a = 4.85 ± 0.08 Å, b = 10.34 ± 0.16 Å, c = 6.08 ± 0.13 Å (2σ). The second particle, I1043,1,30 (Orion), contained an olivine grain ≈ 2 µm in length and >500 nm in width. It was polycrystalline with both mosaiced domains varying over ≈ 20 and additional unoriented domains, and contained internal strain fields < 1%. The unit cell dimensions of the olivine were a = 4.76 ± 0.05 Å, b = 10.23 ± 0.10 Å, c = 5.99 ± 0.06 Å (2σ), which limited the olivine to a forsteritic composition (2σ). Orion also contained abundant spinel nanocrystals of unknown composition, but unit cell dimension a = 8.06 ± 0.08 Å (2σ). Two additional crystalline phases were present and remained unidentified. An amorphous component appeared to be present in both these particles based on STXM and XRF results reported elsewhere.