Gem-A
Encinitas, CA 92024 USA
Division of Geological and Planetary Sciences
California Institute of Technoloty, Pasadena, CA 91125
Abstract
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.
A polished slab through a single sphere of Manakarra amethyst.