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- An outcrop feature developed in igneous and metamorphic rocks as a result of alternation of layers, stripes, flat lenses, or streaks differing conspicuously in mineral composition and/or texture. AGI
- A term applied to veins having distinct layers or bands. This may be due to successive periods of deposition or replacement of some earlier rock. Fay
- A structure developed in many igneous and metamorphic rocks owing to layers that differ noticeably in mineral composition or texture.
- A segregated structure of nearly parallel bands aligned in the direction of working. ASM, 1
Source: Dictionary of Mining, Mineral, and Related Terms