the.com/calcrete

means A hardened layer of soil or rock formed when calcium carbonate accumulates and cements sand, gravel, or soil particles together, typically in arid and semi-arid climates.

from A 20th-century blend coinage, fusing 'calcium' (or 'calcareous,' from Latin calx, meaning lime or limestone) with 'concrete.' The word was built by soil scientists and geologists who needed a term for this natural cementing process, borrowing 'concrete' precisely because the result behaves like the man-made material — hard, dense, and binding loose particles into a solid mass. It belongs to a family of similar geology terms (like 'silcrete' and 'ferricrete') that use the same '-crete' suffix to describe different mineral-cemented hardpans.