Type Locality material of this very rare REE-containing species, the phosphate analog of mixite. Petersite was found by Nick Facciolla 6/81 in a very small ONE-TIME find, although it was eventually named after Thomas Peters(AMNH) instead of its discoverer. This specimen came from the original find and was sold long ago by Facciola to Bob Drift, and through an intermediary to me. The petersite is eye-visible as minute clusters of emerald-green crystals on fracture surfaces in the sandstone matrix [Peacor & Dunn, 1982 Am. Min. 67 (1982), 1039]. This is a small, but very rich specimen. 5 x 3 x 3 mm