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I ran into this Pyrobar stuff the other day. It was lining the floor beneath a back porch. I did some research and it was a fire proof insulator used around structural members but also  used to build non-bearing walls.  The mortar used for this product probably contains asbestos and workers often cut it with a saw.
Here are some links if anyone is interested:

https://archive.org/details/PyrobarGypsumTile5a9d82c70c6d3_P3030015pyrobar.thumb.JPG.94ed300546edeed32b0980a4f1aa6af8.JPG

Edited by Mike Lamb
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