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April 27, 2007, Newsletter Issue #137: Metamorphic Rocks I
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Tip of the Week
If the rock you are classifying has deformed fossils in it, itīs a metamorphic rock.
If the minerals are arranged in bands or streaks, and the streaks are folded or faulted, itīs a metamorphic rock. If the rock appears to be made of colored bands or streaks that arenīt folded or faulted, it might not be metamorphic - it might be an agate.
If it made of a lot of small, shiny crystals so that the whole rock looks like itīs made of glitter, itīs a metamorphic rock that has a lot of mica in it.
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