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

Gemology is traditionally practiced in laboratories, focused on identifying and analyzing gemstones.

Fancy colour diamonds that derive their colour from nitro- gen-related defects (such as N3/N2 center

Larimar, a massive blue variety of the mineral pectolite, belonging to the wollastonite group of min