Typomorphic features of tourmalines of the Malkhan pegmatite field from the Irkutyanka vein

pinel is a highly valued gemstone, with its color and quality influenced by trace-element chemistry

Museums are unique repositories of international treasures. They are also places of active research,

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