Type of rock (5)

'type of rock' is the definition.
(I know that slate is a type of rock)
This is the entire clue.
(Other definitions for slate that I've seen before include "Bluish-grey colour" , "Roofing tile" , "Rubbish" , "Criticise harshly" , "Roofing plate" .)
'type of rock' is the definition.
(I know that granite is a type of batholite)
This is all the clue.
(Other definitions for granite that I've seen before include "Tearing (anag.)" , "Crystalline rock" , "Constituent in Dartmoor" , "Hard stone from Tangier" , "Very hard type of rock" .)
'type of rock' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for igneous that I've seen before include "(Of rock) solidified from a molten state" , "Formed by intense heat" , "Fire-formed rock" , "Originally molten (rock)" , "Of fire, fiery" .)