In geology, a type of banded or streaked igneous rock with alternating layers of different minerals or compositions; a rock showing wavy lamination.
From German 'Flaser' or Scandinavian sources meaning 'streak' or 'stripe.' The term is a specialized geological vocabulary borrowed from German mining terminology where such rocks were first formally classified.
Flaser rocks reveal ancient geological violence—those beautiful wavy stripes form when magma cools under extreme pressure and stress, creating patterns that geologists can read like a story of Earth's internal drama.
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