When we were in Patzcuaro, Michoacan a couple of years ago
they were replacing some sidewalks in the downtown area
with what I believe was a basalt stone.
In these first two photos they are putting in the curbing.
Then the walk area.
Notice in the lower left corner the use of "chinks"
in the narrow strip next to the curb.
This uses up scraps,
fills a difficult spot where cutting would be tedious,
creates a visual edge,
and looks pretty darn nice to boot.
This section is almost complete
except for a few more chinks to put in along the edge.
In a country that is notorious for dangerous sidewalks
these stand out.