Metamorphic%20Rocks

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Metamorphic Rocks
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Refresher
Rock Type Comes from.
Igneous -------------------------------- Sediment
ary -------------------------- Metamorphic
-------------------------
Molten rock Sediments Pre-existing rock
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What turns an Pre-existing rock into a
Metamorphic rock?
Remember this?
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The following slides will show you metamorphic
rocks and the parent rock from which they come.
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Remember Granite? (Igneous Intrusive)
Plagioclase Feldspar
Orthoclase Feldspar
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Granite turns into
Gneiss
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banded-gneiss in Arizona
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Remember Limestone? (Sedimentary Organic)
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Limestone turns into Marble
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Marble bust of Pharaoh
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Remember Sandstone? (Sedimentary Clastic)
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Sandstone turns into Quartzite
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Remember Shale? (Sedimentary Clastic)
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Shale turns into Slate
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Back in the Little House on the Prairie days..
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• Now theres one more oddball metamorphic rock
  that doesnt fit the mold as the others have.
  This metamorphic rock can come from a variety of
  parent-rocks (but it still is given the same
  metamorphic name).
• And that name is.

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Schist (Shhh-ist)
Any of various medium-grained to coarse-grained
metamorphic rocks composed of laminated, often
flaky parallel layers of chiefly micaceous
minerals.
Schists can come from muds and clays that undergo
the metamorphic process. Schists are typically
named for the prominent mineral thats in it,
such as garnet schist or a mica schist.
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Mica Schist
Garnet Schist
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Garnet Schist closer view
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Schist triad sculptures of Menkaure
(Menkoora)
2525 b.c., king of ancient Egypt. He built the
third pyramid at Giza.
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Schists are frequently used in building houses or
walls, as many are quite durable and strong. Most
of the building foundations built in the 1920s
and 30s within the New York city area used
schist.
Manhattan Schist
http//www.newyorkcitywalk.com/html/images_schist.
html