Astrophysics and Space Science

, Volume 35, Issue 1, pp 97–115 | Cite as

On the presence of phyllosilicate minerals in the interstellar grains

  • A. Zaikowski
  • R. F. Knacke
  • C. C. Porco


The composition of the interstellar silicate dust is investigated. Condensation or alteration of silicate grains at temperatures of a few hundred degrees, in the presence of H2O, would result in hydrous or phyllosilicates, the silicate type most abundant in the type I carbonaceous chondrites. Infrared spectra of small particles (∼0.1 μ) of the high temperature condensates, olivine and pyroxene, at 300 K and 4 K do not give a good match to the interstellar absorption band near 9.8 μ. Laboratory spectra of several phyllosilicates give better agreement as does the spectrum of a carbonaceous chondrite. We propose that the silicates in the interstellar grains are predominantly phyllosilicates and suggest additional spectral tests for this hypothesis.


Dust Silicate Absorption Band Olivine Small Particle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© D. Reidel Publishing Company 1975

Authors and Affiliations

  • A. Zaikowski
    • 1
  • R. F. Knacke
    • 1
  • C. C. Porco
    • 1
  1. 1.Dept. of Earth and Space SciencesState University of New YorkStony BrookUSA

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