LARA wrote about concrete with glass pieces in it.

The NY SHPOffice is working with a group in Sullivan County to list on the
National Register a large group of synagogues.  One in particular is of note
because it has small pieces of colored glass strewn about the stucco.

Built in 1924, Congregation Agudas Achim was built by Issy Brooks and his
brother, both builders in the area.  It is a wood frame structure with
stucco applied over expanded metal lath.  Mixed throughout the stucco are
pieces of colored glass (light amber, dark amber, deep red, green, dark blue
and sky blue.)  Interstingly, most of these colors also appear in the
stained glass windows that adorn the building.

At this point we have not found this treatment in any of theother synagogues
(although stucco seems to be the material of choice).  I was just about to
start researching promotional literature from the period, including the
Portland Cement Institute,  the stucco propagandists of the time, and also
the Pittsburgh Glass company to see if any of them promote putting glass in
stucco.

I'd like to keep following the string of replies aboutstucco andconcrete to
see what I canlearn for you all.  And I will let you know if I turn up
anything in my search.

Michael The Glazed