Feldspar's fracture is brittle
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It has both cleavage and fracture.
Plagioclase feldspar is a non-metallic mineral. It has 2 cleavages at nearly right angles. It is also differentiated from potassium feldspar because it contains striations. Potassium feldspar has 2 cleavages at nearly right angles.
You might be thinking of a stress fracture; a fracture of a bone caused by repeated (rather than sudden) mechanical stress.
Infection can interfere with bone repair. This risk is greater in the case of a compound fracture (a bone fracture causing an open wound) where ideal conditions are present for severe streptococcal and staphylococcal infections
a fracture