Lecture Quiz 1
1. Name the six systems
triclinic, monoclinic, orthorhombic, tetragonal, hexagonal, isometric
2. Which crystal system has the following unit cell relationships?
a b c, = = 90
monoclinic
3. A crystal form consisting of two parallel faces (related by a center of symmetry) is called a
pinacoid
Lecture Quiz 2
1. The smallest unit of a crystal lattice that, when repeated infinitely in three directions, produces the
entire crystal is a
a. proton
b. unit cell
c. point group
d. end member
e. neutron
2. What is the Miller index of the form pictured at right?
a. {100}
b. (100)
c. (111)
d. {111}
e. {110}
3. If a neutral atom becomes electrically charged by giving up one or
more electrons, the resulting particle is known as
a. a proton
b. a neutron
c. a cation
d. an anion
e. a noble gas
Lecture Quiz 3
1. The most abundant (weight %) anion in the Earth's crust is
a. silicon
b. sulfur
c. carbon
d. oxygen
e. iron
2. The most abundant (weight %) cation in the Earth's crust is
a. silicon
b. sulfur
c. helium
d. iron
e. oxygen
3. Two or more minerals with the same chemical composition but different crystal structures are referred
to as
a. amorphous
b. isostructural
c. electropositive
d. pseudomorphs
e. polymorphs
Lecture Quiz 4
1. Igneous rocks that are relatively enriched in Mg- and Fe-bearing minerals (e.g., olivine,
pyroxenes, amphiboles) are termed
a. granites
b. plutonic
c. metasomatic
d. mafic
e. felsic
2. The physical property defined as the density of a mineral divided by the density of water at
4°C is
a. specific gravity
b. Curie temperature
c. exsolution
d. crystal field effect
e. pyroelectricity
3. Native iron or iron-nickel alloys such as kamacite and taenite are most characteristic of what
type of rock?
a. iron formations
b. layered mafic intrusions
c. meteorites
d. evaporites
e. porphyry copper deposits
Lecture Quiz 5
1. Replacement deposits in carbonate rocks (sometimes called “Mississippi-Valley-type
deposits”) are characterized by
a. magnetite, molybdenite, cassiterite, scheelite
b. galena, sphalerite (also marcasite, fluorite)
c. realgar, orpiment, stibnite, cinnabar
d. chalcopyrite, pyrite, bornite, molybdenite
e. goethite, hematite, malachite, cuprite
2. Cleavage in galena is described as
a. good prismatic {110}
b. perf. cubic {001}
c. perf. octahedral {111}
d. perf. dodecahedral {011}
e. poor or none
3. A distinctive property of magnetite is
a. reddish streak
b. piezoelectricity
c. phosphorescence
d. ferrimagnetism
e. solubility in H2O
Lecture Quiz 6
1. Bauxite deposits are indicative of
a. metamorphism at high pressure and low temperature
b. crystal settling in mafic and ultramafic rocks
c. intense tropical weathering
d. evaporation of saline lakes in an arid environment
e. supergene enrichment of copper sulfides
2. Which of the following minerals is the main constituent of limestone and marble?
a. quartz
b. gypsum
c. calcite
d. pyrite
e. anhydrite
3. What is the coordination polyhedron for Si4+ with O2- in the silicate minerals?
a. linear
b. triangular
c. tetrahedral
d. octahedral
e. cubic
Lecture Quiz 7
1. The silicate structure at right is representative of which major group of minerals
a. cyclosilicates
b. inosilicates (single chain)
c. inosilicates (double chain)
d. phyllosilicates
e. tectosilicates
2. Double chain inosilicate minerals, such as amphiboles, contain the following structural component
a. SiO44-
b. SiO20
c. Si6O1812-
d. Si8O2212-
e. Si2O64
3. The silicate structure at right is representative of which major group of minerals
a. nesosilicates
b. sorosilicates
c. inosilicates (double chain)
d. phyllosilicates
e. tectosilicates
Lecture Quiz 8
1. Tectosilicate minerals, such as quartz and feldspars, contain the following structural
component
a. SiO44- d. Si4O104-
b. Si2O76- e. Si2O64-
0 1-
c. SiO2 [or AlSi3O8 ]
2. Which major cation sometimes substitutes for Si4+ in the silicon tetrahedron?
a. K+ d. Fe2+
b. Ca+ e. Mg2+
3+
c. Al
3. Staurolite occurs primarily in
a. ultramafic rocks
b. granitic pegmatites
c. metamorphosed limestone and dolostone
d. alkaline lake sediments
e. medium-grade pelitic metamorphic rocks
4. What is the crystal system of common quartz (-quartz)?
a. triclinic
b. orthorhombic
c. hexagonal (rhombohedral)
d. isometric
e. all of the above
Lecture Quiz 9
1. A common twin variety in plagioclase consisting of polysynthetic twinning on {010} is
a. Carlsbad c. albite e. Manebach
b. microcline d. penetration
2. An intergrowth consisting of irregular lenses or patches of Na-rich feldspar in a host of K-rich
feldspar (generally microcline) is referred to as
a. anorthite c. twinning e. pegmatite
b. graphic granite d. perthite
3. The plagioclase series is an example of
a. a simple solid solution series with Ca substituting for K
b. an omission solid solution series with vacancies substituting for Ca and Na
c. a simple solid solution series with Ca substituting for Na
d. a coupled solid solution series with Ca+Al substituting for Na+Si
e. exsolution of Na-rich and K-rich feldspars from a homogeneous solid
4. Which of the following minerals are characteristic of high-pressure rocks that were shocked
by a meteorite impact?
a. -quartz c. tridymite e. coesite and stishovite
b. -quartz d. cristobalite