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

Synthesis methods to produce large and high-quality dia- mond for jewellery have been improved over

Euclase, monoclinic crystal system—is a seldomly occurring mineral and with a Mohs hardness of 7 a

Most of the spinels are found in shades of red to purple. Colourless, green and cobalt bearing varie