Earth Science
Metamorphic Rocks Objective Sheet
Upon completion of the lab activities, homework, and reading
assignments, each student should be able to:
1. Describe the conditions that cause metamorphism.
2. Describe how rocks change as a result of metamorphism.
3. Identify specimens of metamorphic rocks.
4. Explain the meaning of the following vocabulary words:
regional metamorphism
contact metamorphism
foliation
slatey cleavage
schistosity
gneissic layering
slate
phyllite
schist
gneiss
marble
quartzite
metaconglomerate
metabreccia
Dichotomous Key to Metamorphic Rocks
1.
a. Foliated ---------------------b. Non-foliated -----------------
2
5
2.
a. Visible crystals -------------b. Crystals not visible ----------
3
4
3.
a. Shiny, platey minerals ------b. Alternating dark and light
bands --------------------------
Schist
4.
a. Shiny surface ---------------b. Dull surface ------------------
Phyllite
Slate
5.
a. Made of gravel-sized fragment
of rock welded together------b. Crystalline or sand-sized
fragments welded together ---
6.
a. Relatively soft, scratched
surface fizzes with acid ------b. Relatively hard,
never fizzes --------------------
Gneiss
Metaconglomerate
6
Marble
Quartzite