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| ES0610 |
Metamorphic Layering |
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! Read
the questions below each image.
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| Is the layering very fine with no visible crystals?
If yes, your sample is probably slate. Slate exhibits very flat non-shiny surfaces. |
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| Is the surface shiny or does it have a
slight sheen that reflects light? If yes,
your sample is probably phyllite. |
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| Does the rock have
shiny, visible crystals, all aligned in the
same direction? If yes, your sample is probably
schist. Schist may exhibit small folds.
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| Does the layering consist of alternating
dark and light-colored bands? If yes, your sample is probably
gneiss.
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If you have identified your sample, return to the beginning
of the rock identification
key, select another rock sample, and begin the process
over again.
If your rock sample does not have any of the features
described on this page, re-examine the rock with a hand
lens or magnifying glass. Look at the sample from all
angles. Concentrate on fresh surfaces where you might
be able to better determine the texture. Return to the
beginning of the rock identification
key and start over again.
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