Museum Yofortierite was described from Mont Saint-Hilaire in 1975. It is the manganese analog of palygorskite.
Color ranges from pink to pale violet, violet and brown.
Luster is silky to dull. Diaphaneity is translucent. Crystal Habits include matted aggregates of random or radiating capillary and fibrous crystals to 3cm and fibrous masses. Cleavage not observed. Streak is pale pink.