What is "karelianite"

n. (context mineralogy English) A trigonal-hexagonal scalenohedral black mineral containing oxygen and vanadium.

Karelianite is an rare mineral, a natural form of vanadium(III) oxide, VO. In terms of chemistry it is vanadium-analogue of hematite, corundum, eskolaite, tistarite, bixbyite, avicennite, and yttriaite-(Y). It may be associated with magnesium-rich rocks.