Lab 8 - Metamorphic Rocks (1)
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College of Southern Nevada *
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Course
103
Subject
Geology
Date
Dec 6, 2023
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3
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Section
Lab 8:
Metamorphic Rock Identification
FOLIATION: Number these different foliation types in order of metamorphic grade
from lowest (1) to highest (5)
Gneissic
Migmatitic
Phyllitic
Schistose
Slatey
INDEX MINERALS IN FOLIATED METAMORPHIC ROCKS:
most foliated rocks are rich in silicate
minerals. Some minerals form only in limited pressure and temperature conditions, and so are
indicative of a particular metamorphic grade. Use the available Index Mineral chart in your lab
reading and list which of these silicate minerals are most likely to be found in these foliated
metamorphic types. Some minerals may occur in multiple grades of metamorphic rock:
Amphibole
Biotite
Chlorite
Garnet
Kyanite
Muscovite
Pyroxene
Sillimanite
Staurolite
SLATE
PHYLLITE
SCHIST
GNEISS
NON-FOLIATED METAMORPHIC COMPOSITIONS:
match which minerals are found in which
non-foliated metamorphic rocks. Consult the non-foliated metamorphic rock identification
chart in your lab reading for assistance.
b. Garnet
c. Dolomite
d.
Calcite
a.
Quartz
Amphibolite
Quartzite
Marble
e. Amphibole
Metaconglomerate
PARENT ROCK COMPOSITION:
fill in likely parent rock(s) for each of the following
metamorphic rocks: Use your text chapter or the Metamorphic Rock Identification Charts for
assistance.
Slate
Phyllite
Schist
Gneiss
Migmatite
Marble
Quartzite
Metaconglomerate
Hornfels
_
Amphibolite
Greenstone
Anthracite
Speccimen 2
Rock Name:
Specimen 4
Rock name:
Foliated or NF?
If foliated circle one: slatey, schistose, gneissic
If non-foliated, circle one:
quartz, quartz with rock fragments, calcite
Specimen 1
Rock name:
Foliated or NF?
If foliated circle one: slatey, schistose, gneissic
If non-foliated, circle one:
quartz, quartz with rock fragments, calcite
Foliated or NF?
If foliated circle one: slatey, schistose,
gneissic
If non-foliated, circle one:
quartz, quartz with rock fragments, calcite
Specimen 3
Rock Name
Foliated or NF?
If foliated circle one: slatey, schistose, gneissic
If non-foliated, circle one:
quartz, quartz with rock fragments, calcite
Specimen 5
Rock name:
Foliated or NF?
If foliated circle one: slatey, schistose, gneissic
If non-foliated, circle one:
quartz, quartz with rock fragments, calcite
Metamorphic Rock ID
Identify the five metamorphic rock specimens from your specimen kit's rock bag. You will have
one of each: slate, schist, gneiss, quartzite or metaconglomerate and pink or white marble.
Place each
in a spot on the chart below, fill in the texture/composition properties as indicated at the bottom of each
box, and apply a rock name based on the texture/composition.
Photograph and submit with the rest of
your worksheet.
Lab kit Letter _____
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