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

Jade or "Fei Cui" are trade names for a stone that typi- cally contains only one or more main minera

A newly observed variety of faceted transparent brown sapphire has recently entered the gem market,