Gem-quality pink fluorite from Planggenstock, Switzerland: chemical and physical properties and a comparison with pink fluorites from other localities

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

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

In the accretionary Hellenides Orogen, gems occur in various rock types of mainly four tectonometamo