title: Ordered lattice defects in colored fluorite: direct observations.
abstract: Ordered arrays of defect aggregates in the (111) planes of natural fluorite have been observed by transmission electron microscopy. The intense blue coloration observed in corresponding sample areas after 200-kilovolt electron microscopy confirms the conclusion that these are color-center aggregates and, conversely, that color centers are primarily responsible for fluorite coloration.
authors.forename: L E
authors.initials: LE
authors.lastname: Murr