ESS 101 LABORATORY 3A: ADVANCED
INTRODUCTION TO MINERALS
QUESTIONS AND ANSWERS WITH
VERIFIED SOLUTIONS. JUST
RELEASED
1. Which of the following is NOT a requirement for a substance to be classified as a mineral?
A. It must be naturally occurring.
B. It must have a definite organic origin.
C. It must be a solid substance.
D. It must possess an ordered internal atomic structure.
Answer: B
Conceptual Explanation: By definition, a mineral must be inorganic; substances produced
by biological processes are generally not considered minerals unless they undergo
geological processes.
2. Graphite and diamond are examples of polymorphs because:
A. They share the same chemical composition but different crystal structures.
B. They have the same crystal structure but different chemical compositions.
C. They are both composed of carbon but have the same hardness.
,D. They belong to the same silicate subclass.
Answer: A
Conceptual Explanation: Polymorphs are minerals with the same chemical composition
(Carbon) but different atomic arrangements due to different formation conditions.
3. On the Mohs scale of hardness, which mineral is defined as having a hardness of 7?
A. Quartz
B. Fluorite
C. Topaz
D. Orthoclase
Answer: A
Conceptual Explanation: Quartz is the index mineral for a hardness of 7 on the Mohs
scale.
4. What physical property describes the way a mineral reflects light from its surface?
A. Streak
B. Diaphaneity
C. Luster
D. Cleavage
Answer: C
, Conceptual Explanation: Luster refers to the quality and intensity of light reflected from
the surface of a mineral, categorized as metallic or non-metallic.
5. A mineral that breaks along smooth, flat planes is said to exhibit:
A. Conchoidal fracture
B. Ductility
C. Cleavage
D. Tenacity
Answer: C
Conceptual Explanation: Cleavage is the tendency of a mineral to break along planes of
weak atomic bonding.
6. The fundamental building block of all silicate minerals is:
A. The iron-sulfur octahedron (FeS2)
B. The carbon-oxygen triangle (CO3)2-
C. The silicon-oxygen tetrahedron (SiO4)4-
D. The sodium-chloride cube (NaCl)
Answer: C
Conceptual Explanation: The silicate tetrahedron, consisting of one silicon atom
surrounded by four oxygen atoms, is the base unit for the most common mineral group.
INTRODUCTION TO MINERALS
QUESTIONS AND ANSWERS WITH
VERIFIED SOLUTIONS. JUST
RELEASED
1. Which of the following is NOT a requirement for a substance to be classified as a mineral?
A. It must be naturally occurring.
B. It must have a definite organic origin.
C. It must be a solid substance.
D. It must possess an ordered internal atomic structure.
Answer: B
Conceptual Explanation: By definition, a mineral must be inorganic; substances produced
by biological processes are generally not considered minerals unless they undergo
geological processes.
2. Graphite and diamond are examples of polymorphs because:
A. They share the same chemical composition but different crystal structures.
B. They have the same crystal structure but different chemical compositions.
C. They are both composed of carbon but have the same hardness.
,D. They belong to the same silicate subclass.
Answer: A
Conceptual Explanation: Polymorphs are minerals with the same chemical composition
(Carbon) but different atomic arrangements due to different formation conditions.
3. On the Mohs scale of hardness, which mineral is defined as having a hardness of 7?
A. Quartz
B. Fluorite
C. Topaz
D. Orthoclase
Answer: A
Conceptual Explanation: Quartz is the index mineral for a hardness of 7 on the Mohs
scale.
4. What physical property describes the way a mineral reflects light from its surface?
A. Streak
B. Diaphaneity
C. Luster
D. Cleavage
Answer: C
, Conceptual Explanation: Luster refers to the quality and intensity of light reflected from
the surface of a mineral, categorized as metallic or non-metallic.
5. A mineral that breaks along smooth, flat planes is said to exhibit:
A. Conchoidal fracture
B. Ductility
C. Cleavage
D. Tenacity
Answer: C
Conceptual Explanation: Cleavage is the tendency of a mineral to break along planes of
weak atomic bonding.
6. The fundamental building block of all silicate minerals is:
A. The iron-sulfur octahedron (FeS2)
B. The carbon-oxygen triangle (CO3)2-
C. The silicon-oxygen tetrahedron (SiO4)4-
D. The sodium-chloride cube (NaCl)
Answer: C
Conceptual Explanation: The silicate tetrahedron, consisting of one silicon atom
surrounded by four oxygen atoms, is the base unit for the most common mineral group.
