What stone? ;-)
What stone? ;-)
So what ? It's a sedimentary rock, made of some granular stuff and a binder. Generally the grains are silicaceous and the binder is an iron oxide, but there are plenty of calcareous sandstones around. There are also a few large-grained limestones where, because the grains are visible, they find themselves described as "sandstone" when they're really anything but.
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