Many specimens contain some zinc as well. Bayldonite, which was discovered at Penberthy Croft Mine in Cornwall, England, can be used to make attractive cabochons, but is also nice as cabinet specimens. Specimens are known from only a few localities, so treasure any that can be found. Color is green to yellow-green or yellow. Luster is resinous.
Crystals are transparent to translucent.
Crystal System is monoclinic. Crystal Habits include tabular crystals, radiating fibrous, granular and massive crusts. Cleavage is absent. Fracture is uneven. Streak is green.