What type of cloud is made out of ice crystals?

The type of cloud made primarily of ice crystals is known as cirrus clouds. These clouds are high-altitude clouds that form at elevations typically above 20,000 feet (6,000 meters) and are characterized by thin, wispy strands. Cirrus clouds often indicate fair weather but can also signal an approaching storm. They are usually white and appear feathery due to their delicate structure.