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Questions and Answers
What is the primary difference between cleavage and fracture in minerals?
What is the primary difference between cleavage and fracture in minerals?
- Cleavage is a specific break along planes, while fracture is a random break. (correct)
- Cleavage is a random break, while fracture is a specific break along planes.
- Cleavage refers to the mineral's color, while fracture refers to its luster.
- Cleavage and fracture are the same thing, just different terms.
Calcite exhibits 3 planes of cleavage at 90 degrees.
Calcite exhibits 3 planes of cleavage at 90 degrees.
False (B)
What is the term used to describe the way a mineral breaks when it exhibits no cleavage?
What is the term used to describe the way a mineral breaks when it exhibits no cleavage?
Fracture
Quartz typically exhibits a ______ fracture.
Quartz typically exhibits a ______ fracture.
Match the following mineral habits with their corresponding descriptions:
Match the following mineral habits with their corresponding descriptions:
Which of these minerals exhibits 3 cleavage planes at 90 degrees?
Which of these minerals exhibits 3 cleavage planes at 90 degrees?
A mineral with a dipyramidal habit will have 6 faces shaped like rhombi.
A mineral with a dipyramidal habit will have 6 faces shaped like rhombi.
Describe the crystal habit known as 'bladed'.
Describe the crystal habit known as 'bladed'.
Flashcards
Cleavage
Cleavage
The ordered breakage of a mineral along specific planes due to weaker bonds.
Fracture
Fracture
The unordered breaking of a mineral without specific planes.
Calcite Cleavage
Calcite Cleavage
Calcite exhibits 3 planes of cleavage that are not at 90 degrees.
Quartz Fracture
Quartz Fracture
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Muscovite Cleavage
Muscovite Cleavage
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Feldspar Cleavage
Feldspar Cleavage
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Fluorite Cleavage
Fluorite Cleavage
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Cubic Habit
Cubic Habit
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Study Notes
Mineral Identification Exam 1 Prep
- Cleavage vs. Fracture: Cleavage is the ordered breakage of a mineral along specific planes due to weaker bonds. Fracture is the unordered breaking of a mineral, like a demolition without rhyme or reason.
Cleavage Example
- Calcite exhibits 3 cleavage planes not at 90 degrees.
Fracture Example
- Quartz exhibits conchoidal fracture instead of cleavage.
Types of Cleavage
- 1 Direction: Basal cleavage (Muscovite)
- 2 Directions at 90°: Pinacoidal cleavage (Feldspars)
- 2 Directions not at 90°: Prismatic cleavage (Hornblende)
- 3 Directions at 90°: Cubic cleavage (Halite)
- 3 Directions not at 90°: Rhombohedral cleavage (Calcite)
- 4 Directions: Octahedral cleavage (Fluorite)
Crystal Habits
- General Forms and Combinations: Various shapes like acicular (needles), tetrahedral, pyramidal, cubic, bladed, dipyramidal, botryoidal, tabular, dipyramidal, prismatic, radial, fibrous, and scalenohedral are displayed.
- Detailed diagrams and descriptions of each crystal habit are shown.
Visual Guides for Habits
- Examples of dipyramidal and cubic habits are provided with images.
- Examples of bladed and tabular habits are shown with images.
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