Wiktionary
schreyerite
n. (context mineralogy English) A vanadium titanium oxide mineral found in Kenya; it is a polymorph of kyzylkumite.
Wikipedia
Schreyerite
Schreyerite (VTiO), is a vanadium, titanium oxide mineral found in the Lasamba Hill, Kwale district in Coast Province Kenya. It is polymorphous with kyzylkumite.
The mineral occurs as exsolution lamellae and particles in rutile, coexisting with kyanite, sillimanite, and tourmaline in a highly metamorphosed gneiss. It was named after German mineralogist and petrologist Werner Schreyer, for his research on mineralogy of rock-forming minerals and petrology of metamorphic rocks both in nature and by experiment.