ESS 101 LAB 3A: ADVANCED
MINERALOGY AND IDENTIFICATION
QUESTIONS AND ANSWERS WITH
VERIFIED SOLUTIONS. JUST
RELEASED
1. Which of the following is NOT a required characteristic for a substance to be classified as a
mineral?
A. Naturally occurring
B. Organic origin
C. Definite chemical composition
D. Ordered internal crystalline structure
Answer: B
Conceptual Explanation: By definition, minerals must be inorganic. Organic substances
like coal are not considered minerals because they are formed from biological remains.
2. Polymorphs are minerals that have the same chemical composition but different crystal
structures. Which pair represents polymorphs?
A. Quartz and Cristobalite
B. Calcite and Halite
,C. Pyrite and Chalcopyrite
D. Biotite and Muscovite
Answer: A
Conceptual Explanation: Quartz and Cristobalite (along with Diamond and Graphite) are
polymorphs; they share the same chemical formula (SiO2 for quartz) but have different
atomic arrangements.
3. A mineral that breaks along smooth, flat planes of atomic weakness is said to exhibit:
A. Conchoidal fracture
B. Striations
C. Cleavage
D. Crystal habit
Answer: C
Conceptual Explanation: Cleavage is the tendency of a mineral to break along planes of
weak bonding in the crystal lattice, resulting in smooth surfaces.
4. On the Mohs scale of hardness, which mineral is assigned a value of 7?
A. Fluorite
B. Orthoclase
C. Quartz
, D. Topaz
Answer: C
Conceptual Explanation: Quartz is the standard for 7 on the Mohs scale. Fluorite is 4,
Orthoclase is 6, and Topaz is 8.
5. What physical property describes the way light is reflected from the surface of a mineral?
A. Streak
B. Diaphaneity
C. Specific Gravity
D. Luster
Answer: D
Conceptual Explanation: Luster is the appearance of a mineral surface in reflected light,
typically categorized as metallic or non-metallic (vitreous, pearly, earthy, etc.).
6. The fundamental building block of all silicate minerals is the:
A. Silicon-Oxygen Tetrahedron
B. Silicon-Oxygen Octahedron
C. Carbonate Anion
D. Sodium-Chloride Cube
Answer: A
MINERALOGY AND IDENTIFICATION
QUESTIONS AND ANSWERS WITH
VERIFIED SOLUTIONS. JUST
RELEASED
1. Which of the following is NOT a required characteristic for a substance to be classified as a
mineral?
A. Naturally occurring
B. Organic origin
C. Definite chemical composition
D. Ordered internal crystalline structure
Answer: B
Conceptual Explanation: By definition, minerals must be inorganic. Organic substances
like coal are not considered minerals because they are formed from biological remains.
2. Polymorphs are minerals that have the same chemical composition but different crystal
structures. Which pair represents polymorphs?
A. Quartz and Cristobalite
B. Calcite and Halite
,C. Pyrite and Chalcopyrite
D. Biotite and Muscovite
Answer: A
Conceptual Explanation: Quartz and Cristobalite (along with Diamond and Graphite) are
polymorphs; they share the same chemical formula (SiO2 for quartz) but have different
atomic arrangements.
3. A mineral that breaks along smooth, flat planes of atomic weakness is said to exhibit:
A. Conchoidal fracture
B. Striations
C. Cleavage
D. Crystal habit
Answer: C
Conceptual Explanation: Cleavage is the tendency of a mineral to break along planes of
weak bonding in the crystal lattice, resulting in smooth surfaces.
4. On the Mohs scale of hardness, which mineral is assigned a value of 7?
A. Fluorite
B. Orthoclase
C. Quartz
, D. Topaz
Answer: C
Conceptual Explanation: Quartz is the standard for 7 on the Mohs scale. Fluorite is 4,
Orthoclase is 6, and Topaz is 8.
5. What physical property describes the way light is reflected from the surface of a mineral?
A. Streak
B. Diaphaneity
C. Specific Gravity
D. Luster
Answer: D
Conceptual Explanation: Luster is the appearance of a mineral surface in reflected light,
typically categorized as metallic or non-metallic (vitreous, pearly, earthy, etc.).
6. The fundamental building block of all silicate minerals is the:
A. Silicon-Oxygen Tetrahedron
B. Silicon-Oxygen Octahedron
C. Carbonate Anion
D. Sodium-Chloride Cube
Answer: A
