Sample 7: This sample has: a. no cleavage (it fractures) b. 1 cleavage plane c. 2 cleavage plane

step 1 For exercise 125A, we have, and let me write that down, 125A. We have the probability of 2 -21,

Sample 7: This sample has: a. no cleavage (it fractures) b....

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Key Concepts

Cleavage Planes

Cleavage planes are the specific orientations within a crystal where the bonds are weaker, allowing the mineral to split along these predetermined directions. The number and angular relationships of these planes serve as important diagnostic features in mineral identification and relate directly to the crystal's symmetry and internal structure.

Angular Relationships of Cleavage Planes

The angular relationship of cleavage planes, such as being at 90 degrees to one another, provides insights into the symmetry of the crystal lattice. Minerals with cleavage planes at specific angles can indicate underlying crystal geometries and are a key factor in mineralogical classification and analysis.

Cleavage

Cleavage refers to the way a mineral breaks along its natural planes of weakness in its crystal structure. These planes, where bonds are weaker, are typically parallel and smooth, and understanding cleavage is important for identifying minerals and analyzing their internal bonding and structure.

Fracture

Fracture is the term used to describe the way a mineral breaks when it does not break along those natural planes of weakness. Unlike cleavage, which results in smooth, flat surfaces, fracture produces irregular or uneven surfaces, and this property is crucial for distinguishing between minerals with or without a defined cleavage.

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