Rock Exam

Question 1

Porphyritic Andesite

Answer 1

Igneous

Composition - Intermediate (Andesitic)

Texture - Porphyritic

Intrusive

Rate of Cooling - Partial cooling (big crystals cooled slowly, the rest cooled fast)

Question 2

Basalt

Answer 2

Igneous

Composition - Mafic (Basaltic)

Texture - Fine-grained

Extrusive

Rate of Cooling - Fast

Question 3

Vesicular Basalt

Answer 3

Igneous

Composition - Mafic (Basaltic)

Texture - Vesicular

Extrusive

Rate of Cooling - Fast

Question 4

Porphyritic Basalt

Answer 4

Igneous

Composition - Mafic (Basaltic)

Texture - Porphyritic

Extrusive

Rate of Cooling - Two stages (crystals cooled slow, rest cooled fast)

Question 5

Diorite

Answer 5

Igneous

Composition - Intermediate (Andesitic)

Texture - Coarse-grained

Intrusive

Rate of Cooling - Slow

Question 6

Gabbro

Answer 6

Igneous

Composition - Mafic (Basaltic)

Texture - Fine-grained

Intrusive

Rate of Cooling - Fast

Question 7

White Granite

Answer 7

Igneous

Composition - Felsic (Granitic)

Texture - Fine-grained

Intrusive

Rate of Cooling - Fast

Question 8

Pink Granite

Answer 8

Igneous

Composition - Felsic (Granitic)

Texture - Fine-grained

Intrusive

Rate of Cooling - Fast

Question 9

Obsidian

Answer 9

Igneous

Composition - Felsic

Texture - Glassy

Extrusive

Rate of Cooling - Fast

Question 10

Peridotite

Answer 10

Igneous

Composition - Ultramafic

Texture - Fine-grained

Intrusive

Rate of Cooling - Fast

Question 11

Pumice

Answer 11

Igneous

Composition - Felsic

Texture - Vesicular (Glassy)

Extrusive

Rate of Cooling - Fast

Question 12

Rhyolite

Answer 12

Igneous

Composition - Felsic (Granitic)

Texture - Coarse-grained

Extrusive

Rate of Cooling - Slow

Question 13

Porphyritic Rhyolite

Answer 13

Igneous

Composition - Felsic

Texture - Porphyritic

Intrusive

Rate of Cooling - Two stages (crystals cooled slow, rest cooled fast)

Question 14

Alabaster

Answer 14

Sedimentary

Chemical

Question 15

Bituminous Coal

Answer 15

Sedimentary

Biogenic

Question 16

Conglomerate

Answer 16

Sedimentary

Clastic

Question 17

Chalk

Answer 17

Sedimentary

Biogenic

Question 18

Coquina

Answer 18

Sedimentary

Biogenic

Question 19

Oolitic Limestone

Answer 19

Sedimentary

Chemical

Question 20

Skeletal Limestone

Answer 20

Sedimentary

Biogenic

Question 21

Micritic Limestone

Answer 21

Sedimentary

Chemical

Question 22

Dolomitic Limestone

Answer 22

Sedimentary

Chemical

Question 23

Arenitic Sandstone

Answer 23

Sedimentary

Clastic

Question 24

Arkosic Sandstone

Answer 24

Sedimentary

Clastic

Question 25

Greywacke

Answer 25

Sedimentary Clastic

Question 26

Siltstone

Answer 26

Sedimentary Clastic

Question 27

Carbon-Rich Shale

Answer 27

Sedimentary Clastic

Question 28

Clay-Rich Shale

Answer 28

Sedimentary Clastic

Question 29

Chert

Answer 29

Sedimentary Chemical

Question 30

Amphibolite

Answer 30

Metamorphic Non-Foliated (or Foliated, technically) Parent Rock - Mafic or ultramafic igneous rocks

Question 31

Gneiss

Answer 31

Metamorphic Foliated Parent Rock - Shale/Mudstone

Question 32

White Marble

Answer 32

Metamorphic Non-Foliated Parent Rock - Limestone/Dolostone

Question 33

Pink Marble

Answer 33

Metamorphic Non-Foliated Parent Rock - Limestone/Dolostone

Question 34

Phyllite

Answer 34

Metamorphic Foliated Parent Rock - Shale/Mudstone

Question 35

Quartzite

Answer 35

Metamorphic Non-Foliated Parent Rock - Sandstone

Question 36

Biotite Schist

Answer 36

Metamorphic Foliated Parent Rock - Shale/Mudstone

Question 37

Garnet Schist

Answer 37

Metamorphic Foliated Parent Rock - Shale/Mudstone

Question 38

Gray Slate

Answer 38

Metamorphic Foliated Parent Rock - Shale/Mudstone

Question 39

Red Slate

Answer 39

Metamorphic Foliated Parent Rock - Shale/Mudstone

Question 40

Anthracite Coal

Answer 40

Metamorphic Non-Foliated Parent Rock - Bituminous Coal