[bennelson]

I don't know the exact ratio, but it was very much clay.

The bricks were very hard, dense, and whatever the opposite of crumbly is.

Apparently, they have done pressure testing on them and the bricks can hold a CONSIDERABLE amount of weight.

I did get to see the brick compactor machine run a bit. It's very fast. They have a roller belt on the output end of the thing. The only thing I noticed is that they discarded the first couple of bricks made when the machine started up.

For some reason, right when it starts, not quite the right amount of material gets into the compressor, so it's not squished as hard as it should be.