Application of Fibre Optics Reflectance Spectroscopy (FORS) for the determination of mineral pigments in jasper

Amber was recently discovered by local coal miners at the Thanbaya Gaing Coal mine located 6.5 km no

For many, fossiliferous tree resin, primarily amber, gained wide visibility to the public in 1993 wh

The Salininha emerald deposit located in the municipality of Pilão Arcado, Bahia State, represents