abrevoir - joint between stones in masonry.abrevoir - "In
masonry, a joint or interstice between stones, to be filled with
mortar or cement.
A-block - A hollow, concrete masonry unit with one end closed
and the opposite end open, having a web between, so that two cells
are formed when the block is laid in a wall."
abrasion - " A surface discontinuity caused by roughening
abrasion resistance - "The ability of a surface to resist
being worn away or to maintain its original appearance when rubbed
with another object."
abrasive "A hard substance for removing material by grinding,
lapping, honing, and polishing. Common abrasives include silicon
carbide, boron carbide, diamond, emery, garnet, quartz, tripoli,
pumice, diatomite, metal shot, grit, and various sands. these
are usually adhered to paper or cloth."
acidic - Igneous rocks having more than 65% silica are aid to
aciding - The applying of acid to a surface, usually stone, to
create a texture.