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May 4, 2007, Newsletter Issue #138: Crystalline Igneous Rocks
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Tip of the Week
If a rock is made of randomly oriented crystals of different sizes, itīs probably a plutonic igneous rock, one which cooled slowly far below the earthīs surface.
Granite and granitic rocks (light-colored plutonic igneous rocks) often are made of three or more different minerals, so they are often a mixture of clear, white, pink, light gray, and a black minerals grains.
Diorite and other "intermediate" (not light, not dark) rocks are often made of clear, white, and dark minerals - the dark minerals are usually a higher percentage of the total rock than you find in granites.
Gabbro (dark-colored plutonic rock) will appear to be mostly dark minerals.
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