A vertical or near-vertical fracture or joint in rock that formed without significant displacement of the rock on either side.
From Greek 'dia-' (through) + 'klastos' (broken), literally meaning 'broken through.' The term was coined in geology to describe the pattern of natural fractures in rock formations.
Diaclases are what geologists call the straight cracks you see in cliff faces and rocky outcrops—they form from stress in the Earth's crust and actually help create the columnar basalt formations that look like nature's own brick walls!
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