If you find a grapefruit sized rock that appears to have flown through the air from a nearby volcano long ago. what kinds are rocks are they?

If you find a grapefruit-sized rock that has flown through the air from a volcano, it is likely a type of volcanic rock called a pyroclast or tephra. These rocks can include ash, pumice, or scoria, depending on their composition and the eruption's intensity. Pyroclastic materials are typically formed during explosive volcanic eruptions when magma is fragmented and ejected into the atmosphere. The specific characteristics of the rock, such as its texture and weight, can help determine its exact type.