Volcanic andesite (with crystals of hornblende) from the Lake District, 430 million years ago.
Rhyolite is fine grained, associated with silica-rich volcanoes, common in Snowdonia and Borrowdale.
Granite cooled more slowly and has a coarser texture.
In this specimen you can see slate being melting into a granite matrix.
For these drawings I’ve dipped back into my A-level geology notebook.