https://newsoffice.mit.edu/2014/strong-magnetic-field-early-solar-system-1113
The spectral signature of olivine has been seen in the dust disks around young stars. The tails of comets (which formed from the dust disk around the young Sun) often have the spectral signature of olivine, and the presence of olivine has recently been verified in samples of a comet from the Stardust spacecraft.[16] Comet-like (magnesium-rich) olivine has also been detected in the planetesimal belt around the star Beta Pictoris.[17]
http://en.wikipedia.org/wiki/Olivine
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