Lab 8 - Metamorphic Rocks
docx
keyboard_arrow_up
School
University of Texas *
*We aren’t endorsed by this school
Course
3359
Subject
Geology
Date
Dec 6, 2023
Type
docx
Pages
4
Uploaded by CountSalmon1601
METAMORPHIC ROCKS
Part I:
Use your textbook, course
notes, and the metamorphic rocks
provided by your TA to answer the
following questions.
1.
Compare samples 7 and 8.
Which would make a better roofing
shingle? (
Google roofing shingle if
confused
)
Why? (3 pts)
Sample 7 would be better to use as
a roofing shingle. Because it has a
preferred orientation and slate is
naturally mold resistant, fire-resistant, and has a low
water absorption capacity.
2.
Put the following order of metamorphic grade (lowest to highest): schist, migmatite,
phyllite, slate, gneiss. (3 pts)
(Highest)
a)
Migmatite
b)
Gneiss
c)
Schist
d)
Phyllite
e)
Slate
(Lowest)
3.
Look at the sample of Morton Gneiss at the front of the room. What was the parent
rock? What evidence do you see to support this conclusion? (3 pts)
I believe that the parent rock of Morton Gneiss is granite. The reason I think that it is
granite is because it has many layers with folding. Additionally, it shows banding like
gneiss formed in areas of high-grade metamorphism.
4.
Describe any foliation differences between samples 4 and 7.
What causes these
differences? (3 pts)
Gneiss is medium coarse grained while slate is fine grained this is caused by the lack of
contact with metamorphic rocks. The strong compression from foliation causes the slate
to develop fine grained clay and slaty cleavage which ultimately differentiates it from the
Gneiss.
2
Part II: Use your course notes, textbook, and diagnostic tools (streak plate, hardness kit,
hand lens, etc.) to fill in the table of the characteristics for the eight metamorphic rocks
provided by your TA. (1 pt for each rock)
Rock Names
(
which can be used more than once
): Quartzite, phyllite, gneiss, marble,
slate, schist
Sampl
e
Numb
er
Name of
Rock
Parent
Rock
(Protolit
h)
Composit
ion
(Major
Minerals)
Metamor
phic
Grade
Type of
Foliation
1
Quartzite
Sandstone
Quartz
Low
None
2
Quartzite
Sandstone
Quartz
Low
None
3
Phyllite
Shale
Mica
Low-medium
Slaty
Cleavage
4
Gneiss
Shale,
Sandstone,
or igneous
rocks like
granites
Quartz,
feldspar,
garnet,
pyroxene,
amphibole,
mica
High
Banding
5
Schist
Shale
Mica
Medium
Schistose
6
Marble
Limeston
e
Calcite
Low
none
7
Slate
Shale
Mica
Low
Slaty
Cleavage
8
Marble
Limeston
e
Calcite
Low
none
3
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
- Access to all documents
- Unlimited textbook solutions
- 24/7 expert homework help
4