They are called bedding planes
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Metal deposits that occur in the cracks of rocks.
The rocks cracks on everything
Ice wedging, also called frost wedging or frost shattering is a process where water seeps into cracks in rocks and freezes. Since water expands when it freezes this cpushes the cracks further open, eventually breaking the rock apart.
veins
Vein minerals can contain deposits of metals and other minerals, and occur in fissures or cracks of rock.