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prettygoodwordgabbro - n., a dark, coarse-grained igneous rock.
The intrusive plutonic equivalent of basalt, which means you get this instead if the molten rock cools underground instead of errupting onto the surface. Usually composed of some mixture of plagioclase, pyroxene, and sometimes olivine -- and if that means anything to anyone here, you already knew that. Named by a 19th century German geologist after a town in Tuscany near where he first identified it, itself possibly from Latin glaber, bare, smooth, bald, which suggests there was a treeless mountain nearby.
---L.
The intrusive plutonic equivalent of basalt, which means you get this instead if the molten rock cools underground instead of errupting onto the surface. Usually composed of some mixture of plagioclase, pyroxene, and sometimes olivine -- and if that means anything to anyone here, you already knew that. Named by a 19th century German geologist after a town in Tuscany near where he first identified it, itself possibly from Latin glaber, bare, smooth, bald, which suggests there was a treeless mountain nearby.
---L.
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no subject
Date: 2007-10-29 04:40 pm (UTC)no subject
Date: 2007-10-29 09:06 pm (UTC)Which is a problem, as I'm sitting in a cubical farm right now ...
---L.