Pharmacolite is related to a few minerals that have a similar formula and structure. Of these only gypsum is common. O Brushite . Color is white, colorless or gray. Luster is vitreous to pearly.
Specimens are translucent to transparent.
Crystal System is monoclinic. Crystal Habits include acicular crystals and botryoidal crusts and masses. Cleavage is perfect. Streak is white. Associated Minerals include erythrite and other secondary oxidation minerals.