Asked by juhh
Foliation occurs when minerals are flattened by heat and pressure. The results in a layered or banded texture. Which type of rock dl you think is foliated
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Foliation is a feature of metamorphic rocks. Under heat and directed (differential) pressure, platy minerals (like micas) align and recrystallize, producing a layered or banded texture.
Common foliated metamorphic rocks:
- Slate — fine foliation (slaty cleavage), from low-grade metamorphism of shale
- Phyllite — slightly coarser, silky sheen
- Schist — visible platy minerals, pronounced foliation
- Gneiss — high-grade, distinct light/dark mineral bands (banded foliation)
Non-foliated metamorphic rocks (e.g., marble, quartzite) form when pressure is equal in all directions or minerals don’t have platy shapes.
Common foliated metamorphic rocks:
- Slate — fine foliation (slaty cleavage), from low-grade metamorphism of shale
- Phyllite — slightly coarser, silky sheen
- Schist — visible platy minerals, pronounced foliation
- Gneiss — high-grade, distinct light/dark mineral bands (banded foliation)
Non-foliated metamorphic rocks (e.g., marble, quartzite) form when pressure is equal in all directions or minerals don’t have platy shapes.
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