Grape-like 'Manakarra' quartz from Sulawesi, Indonesia

Brendan M. Laurs
Encinitas, CA 92024 USA

George R. Rossman
Division of Geological and Planetary Sciences
California Institute of Technoloty, Pasadena, CA 91125


A new quartz gem was discovered near Mamuju, Sulewesi Island, Indonesia. The material has commonly been sold as 'grape' chalcedony. 


A specimen of Manakarra amethyst.

Manakarra sphere
A polished slab through a single sphere of Manakarra amethyst.