HW # 5 Minerals and Igneous Rocks
Section:
Name:
1.
2.
Date:
Which two properties are most useful in distinguishing
between galena and halite?
A.
cleavage and color
B.
C.
hardness and streak
D. streak and cleavage
6.
The photograph below shows an outcrop where
a light-colored, igneous rock is cross cut by a
dark-colored, igneous rock.
luster and color
What is the approximate density of a mineral with
a mass of 262.2 grams that displaces 46 cubic
centimeters of water?
A.
1.8 g/cm3
B.
5.7 g/cm3
C.
6.1 g/cm3
D. 12.2 g/cm3
This ne-grained, dark-colored, igneous rock is most
likely
3.
4.
A.
rhyolite
B.
diorite
C.
basalt
D. gabbro
Which igneous rock has a vesicular texture and a
felsic composition?
A.
pumice
B.
basalt
C.
granite
D. scoria
7.
8.
Which mineral can be found in all samples of
rhyolite and andesite?
A.
pyroxene
B.
quartz
C.
biotite
D. potassium feldspar
Which material is made mostly of the mineral quartz?
A.
sulfuric acid
B.
pencil lead
C.
plaster of paris
D. window glass
Silicate minerals contain the elements silicon and
oxygen. Which list contains only silicate minerals?
A.
graphite, talc, and selenite gypsum
B.
potassium feldspar, quartz, and amphibole
C.
calcite, dolomite, and pyroxene
D. biotite mica, uorite, and garnet
5.
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.
C.
gabbro
D. scoria
9.
rhyolite
Mineral crystals of quartz, biotite mica, and
amphibole are produced primarily by the
A.
chemical reaction of elements in seawater
B.
cooling and solidi cation of magma
C.
deposition of sediments by a glacier
D. metamorphism of bituminous coal
page 1
10.
Base your answers to tquestions 10 and 11 on the
data table below, which lists some properties of four
minerals that are used as ores of zinc (Zn).
14.
Base your answer to question 14 and 15 on the
diagram below, which shows the results of three
di erent physical tests, A, B, and C, that were
performed on a mineral.
A sample of sphalerite has a mass of 176.0 grams.
What is the volume of the sample?
A.
22.7 cm3
B.
31.4 cm3
C.
40.0 cm3
D. 44.0 cm3
The luster of this mineral could be determined by
11.
A mineral with a hardness of 5 would scratch
A.
all four zinc minerals in the table
B.
zincite, but not sphalerite, smithsonite, or
willemite
C.
zincite and sphalerite, but not smithsonite or
willemite
A.
using an electronic balance
B.
using a graduated cylinder
C.
observing how light re ects from the surface of
the mineral
D. observing what happens when acid is placed on
the mineral
D. zincite, sphalerite, and smithsonite, but not
willemite
12.
The table below lists some information about the
minerals graphite and diamond.
15.
Data Table
Mineral
Composition
graphite
carbon
Depth of Hardness
Formation
shallow
1
diamond
carbon
very deep
10
Electrical
Conductor
good
Which mineral was tested?
A.
amphibole
B.
quartz
C.
galena
D. graphite
poor
Some properties of diamond are di erent from those
of graphite because diamond
A.
has a di erent arrangement of atoms
B.
forms larger crystals
C.
has a di erent composition
16.
The table below shows the approximate mineral
percent composition of an igneous rock. The
photograph shows the true-scale crystal sizes in this
igneous rock.
D. is older in geologic age
Mineral Name
13.
Percentage of
Mineral Present
plagioclase feldspar
55%
Which characteristic do samples of the mineral
pyroxene normally exhibit?
A.
yellow to amber color
B.
bubbling in hydrochloric acid
C.
cleaves at 56 and 124
biotite
amphinole
15%
30%
Based on the above percentage of minerals identify
the igneous rock.
D. hardness of 5 to 6
Section:
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HW # 5 Minerals and Igneous Rocks