Metamorphic
Rocks
CH 3 Prentice Hall
p. 82-86
Formation of Metamorphic Rocks
• Heat and Pressure deep beneath Earth’s
surface can change any rock (ig, sed or met)
into metamorphic rock.
• Forces inside Earth push rock down towards
the heat of the Mantle.
Formation of Metamorphic Rocks
• Pockets of magma can also provide heat.
• Pressure is due to the weight of the overlying
rock. (Deeper=greater pressure)
Classifying (Parent Rocks)
Foliated
Non-Foliated
Parent Rock
Metamorphic
Rock
Parent Rock
Metamorphic
Rock
Granite
Gneiss
Limestone
Marble
Shale
Slate
Sandstone
Quartzite
Classifying Metamorphic Rocks
Foliated
• Thin flat layering
rock
• Grains arranged in
parallel layers or
bands.
• May split along the
bands or layers.
Non-Foliated
• Mineral grains are
arranged randomly.
• Do not split into
layers.
Uses of Metamorphic Rocks
Marble
• Fine even grain, easy
to cut into slabs
• Easily polished.
• Used for buildings
and statues. (Taj
Mahal)
Slate
• Easily splits into flat
pieces.
• Flooring roofing, walkways,
chalkboards
• Comes in a variety of
colors
• Used for trim on buildings