Crystals of azurite belong to the monoclinic system; they have a vitreous lustre and are translucent.
The crystals of prismatic habit represented in figs.
Cesena and Perticara are well-known localities in this district, the latter yielding crystals coated with asphalt.
Mountain winters were always a surprise to lowlanders and easterners, where the chemistry of moisture played games that produced slush and wet snow, not the sparkling crystals so soft a broom could clear a foot-deep snowfall with a few swishes.
It forms monoclinic crystals which are very soluble in water.