Stone
Stone is mineral, not a single substance. Igneous rock cools from melt. Sedimentary rock is compressed debris. Metamorphic rock is older rock rewritten by heat and pressure.
Mountain, crystal, cave, Pebble, Sediment, Clay, and Shell on the map can feed Stone. Lava cools into rock; a Fault is the crack; Erosion is the wearing-off. What looks permanent is slow.