Leadhillite is normally found in secondary deposits in arid areas. This, uncommon, lead, sulfate, carbonate, hydroxide, occurs here as lovely sky blue, translucent crystals to .7 cm in length. Essentially closed by WW2, this venerable old mine has, nevertheless, produced a plethora of fine secondary copper and lead minerals. Among the most desirable is a rich and aesthetic leadhillite such as this and Tiger pieces are considered among the more beautiful examples of the species! This is one of the better specimens I have seen for sale, for both crystal sharpness (often they are too lumpy) and the bright color.