Amethyst with Quartz and Chalcedony (polished slice) (ex Bill and Anne Cook Collection)

Item Description

Here we have a wonderful specimen of these beautiful Quartz slices from Ametista do Sul. The piece is a polished section of an Amethyst stalactite (sliced down the "c" axis) and then was polished on the front and back. You can see the far outer edges are actually colorless Quartz, while most of the crystals are purple Amethyst and the central portion of the slice is banded Chalcedony ranging from tan to sage green to very dark green hues. These specimens are not easy to find on the market these days, though they used to be available from Brazilian dealers more regularly years ago. From the collection of William ("Bill") (1927-2006) and Anne (1928-2021) Cook of Cleveland, Ohio. This husband and wife duo were actively involved in the mineral world for many decades. Bill was a PhD geologist, and Anne was a mathematician, and they both were very serious mineral collectors. Bill served for many years as adjunct curator of mineralogy at the Cleveland Museum of Natural History, and Anne was inducted into the Micromounters' Hall of Fame on October 12, 2019. Both Bill and Anne, at various times, served as president both of the Mineralogical Society of Cleveland and of the Micromineral Society of the Cleveland Museum of Natural History, and Anne was inducted into the mi The rare barium lithium beryllium phosphate Wilancookite was named in their honor in 2015.