Cerro Runa Tullo (Runatullo), Junín, Peru
Close to Huachocolpa pegmatite. Pale greenish blue beryl
crystals up to 6 cm long and 2 cm in diameter, associated with white feldspar and muscovite mica. The crystals are opaque, but some have a blue aquamarine colour with hexagonal zoned structure and their cross sections can be used for jewelry. Density 2.67, hardness 8, RI 1.570 - 1.577.
Ref: J. Hyrsl, Gemstones of Peru, 2012, p. 38