Why No Granite? Options

[atomoid]

...You can get carbonatite volcanic rocks, at least some of which form when magma eats a lot of limestone and you actually have black lava flows with carbonate minerals in them that turn white (on the surface) as they cool.  There's one active carbonatite volcano in Africa, I don't recall if it's carbonates come from assimilated limestone or what....

Thats probably Ol Doinyo Lengai.
dig through the many pictures linked above, this place is a geologic gem, truly amazing stuff. It is the only volcano in the world that erupts natrocarbonatite lava, which contains almost no silicon and is only about half as hot (500c) as basaltic lava so it glows dimly and looks more like mud volcano during the day.

[edstrick]

"Ghods" is an old sciencefictional fannish term, more or less nondemoninational and non-offending. Semantically, it goes with the old fannish drink, "Bheer"

[Guest_BruceMoomaw_*]

Ohkay.