Schist used in a sentence

Schist in a sentence as a noun

Hong Kong is mostly granite, which is significantly more difficult to tunnel than the shale-like schist bedrock of manhattan...and MTR construction reflects this fact, being more expensive per km than London, Paris, or Madrid.

In addition to what others have said about the disruptiveness of cut-and-cover, it's worth noting that Manhattan's bedrock is almost entirely schist[1].I don't know whether that was ever factored into the decision to bore instead of cut, but I'd bet that cutting through schist is a lot harder than the chalk and clay of London and Paris.