Download Igneous Rocks PQs Name: Date: 1. Which mineral can be found in

Igneous Rocks PQs
Name:
1.
Which mineral can be found in granite, andesite, gneiss, and hornfels?
A.
2.
pyroxene
C.
olivine
quartz
B.
calcite
C.
pyroxene
rhyolite
B.
gabbro
C.
granite
rhyolite
B.
granite
C.
gabbro
1.
D. biotite mica
2.
D. olivine
3.
D. basalt
An extrusive igneous rock with a mineral composition of 35% quartz, 35%
potassium feldspar, 15% plagioclase feldspar, 10% biotite, and 5% amphibole is
called
A.
5.
B.
Which extrusive igneous rock is composed of approximately 40% quartz,
20% potassium feldspar, 20% plagioclase feldspar, 10% biotite mica, and 10%
hornblende?
A.
4.
quartz
For an igneous rock to be classi ed as rhyolite, it must be light colored, be ne
grained, and contain
A.
3.
Date:
4.
D. basaltic glass
Which relative concentration of elements is found in a ma c rock?
A.
a high concentration of silicon and a low concentration of iron
B.
a high concentration of iron and a low concentration of aluminum
C.
a high concentration of aluminum and a low concentration of iron
5.
D. a high concentration of aluminum and a low concentration of magnesium
6.
Base your answer(s) to the following question(s) on the Earth Science Reference
Tables and on your knowledge of Earth science.
6.
A ne-grained igneous rock composed mostly of plagioclase feldspar and
hornblende and containing no quartz or pyroxene would be classi ed as
A.
7.
granite
B.
andesite
C.
peridotite
D. scoria
Which common rock is formed from the solidi cation of molten material?
A.
rock gypsum
B.
slate
C.
rhyolite
page 1
D. coal
7.
Igneous Rocks PQs
8.
Which intrusive igneous rock could be composed of approximately 60% pyroxene,
25% plagioclase feldspar, 10% olivine, and 5% amphibole?
A.
9.
11.
B.
rhyolite
C.
gabbro
D. basalt
Which igneous rock has a vesicular texture and a felsic composition?
A.
10.
granite
pumice
B.
basalt
C.
granite
B.
C.
D.
Which igneous rock is dark colored, cooled rapidly on Earth's surface, and is
composed mainly of plagioclase feldspar, olivine, and pyroxene?
A.
obsidian
B.
rhyolite
C.
gabbro
page 2
9.
D. scoria
The diagrams below show the crystals of four di erent rocks viewed through the
same hand lens. Which crystals most likely formed from molten material that
cooled and solidi ed most rapidly?
A.
8.
D. scoria
10.
11.
Igneous Rocks PQs
12.
The three statements below are observations of the same rock sample:
12.
The rock has intergrown crystals from 2 to 3 millimeters in diameter.
The minerals in the rock are gray feldspar, green olivine, green pyroxene, and
black amphibole.
There are no visible gas pockets in the rock. This rock sample is most likely
A.
13.
14.
B.
gabbro
C.
granite
D. phyllite
Which mineral can be found in all samples of rhyolite and andesite?
A.
pyroxene
B.
C.
biotite
D. potassium feldspar
andesite
B.
pegmatite
C.
pumice
B.
C.
D.
page 3
14.
D. scoria
Which graph best represents the textures of granite, pegmatite, and rhyolite?
A.
13.
quartz
Which igneous rock has a vesicular texture and contains the minerals potassium
feldspar and quartz?
A.
15.
sandstone
15.