The morphology of the caves of Lanzarote whilst sharing many features typical in the formation of lava tubes also have some very unique deposits. These are noticeably the copious amounts of a fine white or fawn powdery substance gypsum, found scattered throughout many of the caves in very large quantities, often many feet thick.
Below is a non exhaustive list of some of  the formations to look out for in the caves of Lanzarote with a short description about their content and way of formation.

Formations and Geology of Lanzarote caves