We present 0.4 arcsec-resolution imaging polarimetry at 8.7, 10.3, and 12.5 microns, obtained with CanariCam the Gran Telescopio Canarias, of central region W51 IRS2. The polarization, as high 14 percent, arises from silicate particles aligned by interstellar magnetic field. separate, or unfold, polarization each sightline into emission absorption components, which we infer morphologies corresp...