Metamorphic Rock Collection
25. Biotite Gneiss. This rock may originally have been Granite. The minerals of
the original rock have been crushed and squeezed by pressure. Minerals: Mica.
26. Granitoid Gneiss. This rock was formerly Granite. Minerals: Feldspar.
27. Schist. Both light and dark colored micas or chlorite may be found in
schists, and they give the rock a glistening appearance. Parent rock was Phyllite.
28. Garnetiferous Mica Schist. This is a mica schist in which there are
numerous Garnet crystals along with Muscovite, Biotite, Quartz, and Feldspar.
Parent rock is either shale, mudstone or felsic igneous rock.
29. Hornblende Schist. This was once a mafic igneous rock. The minerals are
hornblende, mica, garnet and feldspar.
30. Quartzite. This was once Sandstone. Heat and great pressure have made it
more compact. Minerals are mostly quartz.
31. Red Slate. Once a red clay or red shale, this rock is now hard and compact
and splits into flat pieces. Minerals are mostly hematite.
32. Gray Slate. This was formerly a black mudstone or shale containing organic
matter. Minerals are mostly Chlorite.
33. White marble. This is a white, sugary-textured marble used for building
and statuary. Parent rock was Limestone, mineral composition is calcium carbonate.
34. Pink marble. Marbles were once limestone. They will “fizz” if a drop of
dilute acid is dropped on their surface because of the mineral calcium carbonate.
35. Serpentine. This dark green rock often forms by metamorphism of
serpentinite. Minerals are magnesium rich silicates.
36. Soapstone. This soft rock, with a slippery feel, is composed largely of talc.
Parent rock is most likely peridotite.
Metamorphic Rock Lab
Name_____________________ Date_______
1.
How are metamorphic rocks formed?
2.
What are two processes that cause rocks to be metamorphosed into
metamorphic rocks?
3.
Describe the two major groups of metamorphic rocks.
a. Foliated –
b.
Nonfoliated –
4.
What kind of rocks can produce metamorphic rocks?
5.
What rock does granite become when undergoing metamorphism?
6.
What rock does shale become?
7.
What types of environments are the three major types of metamorphism
found?
8.
What two properties of the rock change during metamorphism?
a.
b.
9.
What two things can happen to minerals during metamorphism?
a.
b.
10. What is the difference between foliation (as found in metamorphic rocks)
and stratification (layers found in sedimentary rocks).
11. Other than blackboards, what else can slate be used for today?
12. Examine the metamorphic rocks in the lab and identify the sample numbers
of those that are foliated.
13. Examine the metamorphic rocks in the lab and identify the sample numbers
of those that are nonfoliated.