metamorphic
Slickenside
Fault scarplet mineral slickenside
AI-generated identification · may be incorrectHardness varies by host rock; distinct grooved, striated, or polished surface parallel to fault movement; silky or pearly luster on friction surfaces.
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Physical properties
Hardness varies by host rock; distinct grooved, striated, or polished surface parallel to fault movement; silky or pearly luster on friction surfaces.
Formation & geological history
Formed by frictional sliding and grinding along geological fault planes during tectonic movement.
Uses & applications
Used by geologists to determine the direction of past tectonic slip and fault mechanics.
Geological facts
The polished striae can often tell geologists which side of a fault moved relative to the other.
Field identification & locations
Identify in the field by running fingers across the striated rock surface to feel smooth unidirectional resistance; found globally in fault zones.
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