Colorless vitreous pseudohexagonal crystals of the extremely rare K-Ti silicare mineral davanite from the type locality in Davan stream (Davan Stream, Murunskii Massif, Aldan Shield, Aldan Shield, Sakha Republic, Russian Federation), and only one of the two known localities worldwide. Davanite is a member of the Dalyite group. Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Davanite
Davanite is an IMA-recognized mineral species in the silicate class, with the chemical formula K₂TiSi₆O₁₅.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 5; specific gravity 2.76; Vitreous luster; optically biaxial.
IMA symbol Dvn, IMA status: approved, named in 1982.
Found in contact metamorphic rocks in an alkalic massif (Murun massif, Russia); of magmatic origin, lining vugs in lamproites (Smoky Butte, Montana, USA).
It is found associated with Aegirine, pectolite, titanite, quartz, potassic feldspar, calcite (Murun massif, Russia); phlogopite, diopside, leucite, analcime, olivine, pseudobrookite.
The name refers to the Davan Stream, in the Murun massif, Russia.