parent rock

JK Rowling has said that when her own short-lived marriage imploded, leaving her an unemployed single parent, rock bottom became the foundation upon which she built her life: because her worst fears had been realised, she had nowhere to go but up.

Domaine Ponsot was best known for its grand cru Burgundies, in particular its Clos de la Roche, a vineyard named for the rockiness of its limestone soils — a character expressed, as the French wine writer Jacky Rigaux once put it, “to the chagrin of pickaxes and ploughs but to the delight of the roots that can penetrate into the depths of the parent rock.”

This "parent rock" was very probably basalt of the sort produced on the ocean floor, they say.

These space rocks came from the same parent rock and provided evidence for the first asteroid from the collision.

Now consider this wonderful fact: "The variable chatoyancy that is the gem's signature actually is a record of the parent rock's structural path during past tectonic events."