Museum W hlerite is a very rare mineral at Mont Saint-Hilaire. It is one of the earliest minerals to form in the paragenetic sequence.
Color is usually pale yellow to orange-yellow.
Luster is vitreous to greasy. Diaphaneity is transparent to translucent and opaque. Crystal Habits include thin tabular crystals to 5mm forming aggregates of crystals. Fracture is conchoidal to splintery. Hardness is 5.5 - 6.