Which type of icing is described as brittle and frostlike?

Rime icing is characterized as brittle and frostlike due to the rapid freezing of supercooled water droplets upon contact with an object, such as an aircraft. This type of icing occurs when small, supercooled droplets collide with a surface and freeze almost instantly, creating a rough and white layer of ice. The formation process involves less water content, which leads to its brittle nature, allowing chunks or shards to break off easily.

This description clearly differentiates rime icing from other types. For example, clear icing forms when larger supercooled droplets freeze slowly, resulting in a transparent and smooth layer that can make surfaces dangerously slippery and heavy. Mixed icing contains characteristics of both rime and clear icing but doesn’t specifically match the description given. The term "heavy icing" isn’t a standard classification in aviation meteorology and does not describe a specific type of icing like rime does.