Hrm. The pages I'm finding imply that granite surface plates are made out of blocks, not reconstituted. The ones I've used in the past did kind of feel like there were cemented, but I put that down to the precision finish. I've only ever seen them called granite, but it wouldn't surprise me too much if they were technically some other material. This Starrett page (http://www.starrett.com/pages/860_granite_surface_plates.cfm) has some more details (from a considerably more reputable source than Grizzly).
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