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 any low protective wall or barrier at the edge of a balcony, roof, bridge or the like.

Pit rock face:

rock face in a quarry under exploitation that is being worked on for extraction.


smooth, generally shiny finish to stone that highlights  certain aesthetic qualities (veins, fossils, colour...).


measure of microcavities in stone that contain liquid or gas.Porous rock is generally less frost resistant than hard rock due to the possible expansion of frozen water in the cavities.