Diorite
| Diorite is a medium to dark grey, medium to coarse-grained
intrusive rock. Light
minerals are mainly plagioclase feldspar with no quartz. Dark minerals are abundant,
though less than light crystals, and include pyroxene and hornblende. |
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| Hornblende diorite |
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| Diorite |
| When quartz is present, the rock is a quartz diorite. When dark
minerals are more abundant than light minerals the rock is a gabbro. |
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Last updated May 12, 2005
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