Cumulus quartz is a white crystal found on the planet Bryche, the setting of Project Aleutian. It is found primarily on the fractured continent, the origin of the stone clouds. It has a unique relationship with the planet where it pushes away from the planet instead of being pulled toward it by gravity. The crystal can give objects the appearance of floating or hovering in the air. 

Once the crystals form large enough under the ground, they can tear land masses free from the planet forming stone clouds. These large formations of cumulus quartz that cause the stone clouds to float are called their core crystals. 

Cumulus quartz is one of the most sought-after resources of the stone clouds because it forms the heart of every nation’s airship fleet. These air ships have varying designs based on the traditions of the different nations. Some appear like traditional naval vessels with sails and masts while others host more metallic designs powered only by engine driven propellers. 

While large crystals are generally reserved for airship use, smaller crystals have found their uses in the hands of the people on construction sites, for lifting materials, and in the arts, for very intricate art installations.