Wiluite is a dark green, brownish, or black blocky silicate mineral with the chemical formula Ca19(Al,Mg,Fe,Ti)13(B,Al,[ ])5Si18O68(O,OH)10.

It has a vitreous lustre, poor cleavage and an irregular brittle fracture.

It is isostructural with the vesuvianite group and is associated with wollastonite and olive-green grossulars (viluites) in a serpentinized skarn.

[6][7][8] It was discovered in the 1990s and named for the Wilui River region, Sakha Republic (Yakutia), Russia.

The other author to introduce viluite was Severgin, who used it in reference to what is widely known as grossular, a member of the garnet group.