Pair of ruler selenite on a lucite base. Ruler selenite or "selenite logs" are single, prismatic selenite crystals from Morocco that were formed in extensive beds by the evaporation of ocean brine. This mineral is characterized by a silky, pearly luster called satin spar.
(left) 16.5" high x 4.5" wide 3.5" deep
(right) 16.5" high x 3.5" wide x 2.5" deep