It occurs in guano containing caves as wall encrustations and stalactites. It is an opaque tetragonal mineral typically occurring as brownish yellow encrustations. Zaratite crystallizes in the isometric crystal system as massive to mammillary encrustations and vein fillings. Fumarole deposits contain encrustations and sublimates. It forms as efflorescent encrustations in underground uranium mines. Aurichalcite displays prismatic crystals often in the form of encrustations and sometimes columnar structures. It also can include elaborate carvings, gem encrustations and detailed drawings. The typical form is as encrustations and pulverulent earthy masses. It typically forms encrustations or granular aggregates. It also forms druzy encrustations and reniform (kidney-shaped) masses. The notum and cerata may have opaque white encrustations. Typical occurrence is in dry saline lake beds and as soil encrustations. It forms white silky monoclinic prismatic crystals that are often in radial arrays or encrustations. It forms as prismatic monoclinic crystals and as encrustations. The crystal habit is as platy and mammillary encrustations on its matrix.