Comets are composed mainly of

While some metals can be found in comets, they are not a primary component. Comets are largely composed of volatile substances and organic materials rather than metallic elements. The presence of metals is minimal compared to the dominant ice, rock, and dust.

Igneous rock is formed from the solidification of molten material, which is not representative of comet composition. Comets do contain some rock, but it is not specifically igneous in nature. Instead, the rocky components found in comets are typically a mix of different types of minerals rather than solely igneous materials.

Volcanic dust is derived from volcanic activity on planets or moons and is not a substantial component of comets. Comets do not originate from volcanic processes; instead, they are remnants from the early solar system composed of primordial materials that have not undergone significant alteration or differentiation.