The tendency for a mineral to break along a plane is called the mineral's:

Question

BlackTom AI · Accepted Answer

Cleavage describes how a mineral breaks along specific planes of weakness in its crystal structure.

1. Relevant knowledge points and concepts
- Cleavage: breakage along flat, smooth planes determined by zones of weaker atomic bonds within the crystal lattice. It is described by the quality (perfect, good, poor) and the geometry (number and angles of cleavage planes).
- Fracture (breakage behavior): irregular or curved breakage not along defined planes, e.g., conchoidal fracture.
- Hardness: a measure of resistance to scratching (Mohs scale), not how it splits.
- Crystal form: the external geometric shape a mineral can show due to crystal faces, not the way it breaks.

2. Step-by-step reasoning
- The question asks for the term naming the tendency to break along a plane.
- Minerals break either along specific internal planes (cleavage) or irregularly (fracture).
- Cleavage is directly tied to internal atomic arrangements; if bonds are weaker in certain directions, the mineral will split along those planes when stressed.

3. Intermediate explanations (no numerical calculations required)
- Example: Mica splits into thin sheets because it has one perfect cleavage direction where bonds between sheets are weak. Calcite exhibits three cleavage planes at oblique angles (rhombohedral cleavage). Quartz lacks true cleavage and instead shows conchoidal fracture.

4. Why the correct answer is correct
- “Cleavage” precisely names the tendency to break along a plane of weak bonding within the mineral; this matches the definition in mineralogy.

5. Why the other options are incorrect
- Hardness: relates to scratch resistance, not breakage along planes.
- Breakage behavior: a vague phrase; the standard mineralogical term for breaking along planes is cleavage.
- Crystal form: refers to the external geometric faces of a crystal, not its pattern of breakage.

6. Conclusion
Therefore, the correct answer is cleavage, which matches the provided answer.

The tendency for a mineral to break along a plane is called the mineral's:单项选择题

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