Aurichalcite boasts the brightest teal in the mineral world but it's fibrous nature does not lend itself to beautiful crystals. In Mexico, however, there have been several small discoveries of Calcite crystals heavily included with the teal fibers. This is a top example from the original find and among the most brightly colored Calcites in the kingdom.

Ex. Mary & Gardner Miller colection
Ex. Victor Yount collection

Published: The Mineralogical Record, Mexico II, Vol. 24, No. 5, pg. 59, 2003