Sedimentary Rocks Answer Sheet
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Georgia State University *
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1122L
Subject
Geology
Date
Apr 3, 2024
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docx
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Uploaded by ProfBison3985
Sedimentary Rocks (Lab 4) Answer Sheet
1.
Which of the following are terrigenous sedimentary rocks? Highlight them or delete the ones that are not terrigenous.
Black shale Arkose Intraclastic limestone Diatomite Rock gypsum Quartz conglomerate Oolitic limestone Red sandstone Lignite Graywacke
Chert
Bituminous coal
2.
Describe each of the following:
Chalk reacts with HCL
Kaolin form of clay mineral
Diatomite doesn’t fizz in contact with HCL
3.
Compare Shale vs. claystone Both shale and claystone are sedimentary rocks that are mostly made
of clay minerals; however, shale can split easily into thin layers, whereas claystone does not have this ability and typically has a more blocky or massive structure.
4.
Rock Type Mineral Name
Chemical Formula
Reaction to HCl
Limestone
Calcium Carbonate
CaCo3
yes
Dolostone
Dolomite
CaMg(CO3)2
yes
Rock gypsum
Calcium Sulfate
CaSO4 2H2O
none
Rock salt
Halite
NaCl
none
Chert
Quartz
SiO2
none
Travertine
Calcite
CaCo3
yes
5.
(a) rudites
, (b) arenites
, or (c) argillites
. Put the letter in the blank
. b
1. Lithic sandstone
a
2. Conglomerate with quartz clasts
b
3. Arkose
c
4. Gray silty shale
a
5. Breccia with iron oxide cement
c
6. Kaolinite
6.
(a) calcirudites
, (b) calcarenites
, or (c) calcilutites
. Put the letter in the blank. a
1. Intraclastic limestone
c
2. Chalk
b
3. Oolitic limestone
a
4. Coquina
c
5. Micrite
7.
Put the letter in the blank. h
micrite
a. rounded gravel
g
shale b. plant fragments f
graywacke c. microscopic skeletons of silica c
chalk d. feldspar grains
j
diatomite e. angular gravel
b
lignite f. sand-sized rock fragments i
coquina g. clay d
arkose
h. lime mud
a
conglomerate
i. broken shells
e
breccia
j. coccoliths
8. Allochems
ooids
peloids
intraclasts
Rock sample example for the chart below.
Laboratory Exercise – Sedimentary Rock Identification
Sample #
Grain Size
Minerals or grain type
Fizz in acid?
Describe
Sedimentary Rock Name
Example
See the
sample
above
Gravel
Rock Fragments
No
Rounded fragments
Conglomerate
1.
sand
Shell fragments calcite
yes
coquina
2.
sand
Feldspar, clay, rock fragments
no
graywacke
3.
sand
halite, sulfur, calcite, dolomite
no
Softer than
fingerna
gypsum
4.
gravel
Rock fragments
no
angular grains
Breccia
5.
n/a
halite
no
taste like salt
Rock salt
6.
gravel
rock fragments
no
rounded pebbles in hardened sand or clay
conglomerate
7.
sand
Mostly quartz, contains feldspar and lithic
no
White or colorless grain
quartz sandstone
8.
silt
clay minerals, quartz
no
breaks into
thin layer
Shale
9.
n/a
silica
no
scratches glass
Chert
10.
n/a
dolomite
yes
Dolostone
11.
sand
Quartz feldspar kaolinite
no
Arkose
12.
sand
Shell fragments calcite
yes
Fossiliferous limestone
13.
sand
Oolites and fossils
yes
Round grains with
concentric
lamination
Oolitic limestone
n/a
calcite
yes
Crystalline limestone
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14.
15.
n/a
Carbonaceous material No
Bituminous coal