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I’m curious whether quartzite carries the same risk? They only mention marble and granite as having a lower health risk

Any stone powder is a risk. You don't want rocks in your lungs.

Asbestos come to mind, and it was even more dangerous because of its aspect ratio.

RichLite, Paperlite, and Paperstone make recycled paper outdoor waterproof vert ramps, countertops, siding, and flooring; but not yet roofing FWIU?