Found, Lost, and Found Again: The Geological and Gemological Significance of the Salininha Emerald Deposit, Brazil

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

This paper aims to present the history of the modification of Baltic amber (succinite), and particul

Yuri Shelementyev, Galina Kriulina, Olga Yarapova, Viktor Vins, and Alexander Stolyarevich