Fig. 4b. This scanning-electron photomicrograph is from the same area as in Fig. 4a but now magnified 8,000x. The "x" points to a hole (black) bordered by concentrations of K (light gray). Locally, Ba is concentrated in celsian (ce, white), and in some places the celsian occurs on hole walls adjacent to the K concentrations. Identification of element concentrations are confirmed by microprobe studies.