"Fresh" (latent or unetched) californium-252 fission tracksP. Fraundorf (1978) "The detection of latent nuclear particle tracks in some common minerals with conventional TEM", "Electron Microscopy" "1978 Volume 1 - Physics": Papers presented at the "Ninth International Congress on Electron Microscopy", (Microscopical Society of Canada, University of Toronto), pages 480-481. in a chromite (FeCr2O4) grain from the Allende meteorite, showing up in a weak-beam darkfield TEM image which lights up the strain-fields around the 40Å-diameter track-damage cores. This work confirmed chromite's ability to record nuclear particle tracks in spite of its relatively low resistivity.