Sedimentary Rocks.
limestone
From Runescape Wikia: "The Cavefish are a type of fish that can only be found in the Living Rock Caverns. The Living Rock Caverns can be found underneath the Dwarven Mine..."
Limestone is usually associated with karst topography.
Chemical weathering, particularly when acidic water dissolves and erodes the rock, can create caves or caverns over time. This process is common in limestone regions where the rock is easily dissolved by carbonic acid found in rainwater.
Limestone is the type of rock often associated with the formation of caverns and karst topography. It is composed mainly of calcium carbonate, which is soluble in water, allowing for the creation of caves, sinkholes, and other karst features through the process of dissolution.
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Carlsbad Caverns is primarily formed by dissolution, a type of chemical weathering, of the limestone bedrock by acidic groundwater. This process creates the spectacular caves and caverns found in the area.
Travertine is a type of metamorphic rock. It is also a sedimentary rock, which is usually found near underground water sources.
Limestone. The caves are located in a limestone mountain range called the Guadalupe Mountains.
Salt
Luray Caverns in Virginia primarily features formations of limestone, including stalactites, stalagmites, and flowstone. Some other minerals present in the caverns include calcite, aragonite, and gypsum.
Onyx is a type of mineral formed from the deposition of calcium carbonate in caves. It is not directly formed from lava but can sometimes be found in lava tubes or caverns where it is deposited by water flowing through the rock.