MSH is only the second locality for this species which has the distinction of having the largest unit-cell dimensions of all known species. Color is usually very pale violet, pale pink or white. Luster is vitreous to silky. Diaphaneity is transparent to translucent. Crystal Habits include very fine divergent sprays and tufts of randomly oriented capillary to fibrous crystals to 20mm.
Fracture is uneven.
Hardness is 5 - 5.5. Streak is white.