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
