Museum Hilairite was described as a new species from Mont Saint-Hilaire in 1974. Color is usually pale to dark brown, and pink. Luster is vitreous to waxy to porcelaneous. Diaphaneity is transparent to opaque. Cleavage none observed.
Fracture is concohidal.
Streak is white. Associated Minerals include aegirine, albite, analcime, ancylite, calcite, catapleiite, chlorite group, elpidite, epididymite, eudialyte, fluorite, gaidonnayite, galena, goethite, mangan-neptunite, microcline, natrolite, nenadkevichite, polylithionite, pyrite, quartz, rhodochrosite, sphalerite and zircon. Hilaire, Rouville County, Quebec, Canada.