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Textured
Metamorphic Rocks
Strongly textured
rocks are created by the movement of the rocks under the existing pressures
of the crust. The 3 main groups are distinguished by the types of textures.
Foliated
- Layered or banded textures that may be folded.
| Slates
- compated shales showing planes of clay plates. |
| Phyllites
- mica crystals replacing clay plates; crystals not visible - lusater gives
a sheen. |
| Schists
- mica(or amphibole) crystals visible, form layers with intermixed other
minerals. |
| Gneisses-bands
of different grain types - including mica sheet bands |
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Cataclastic
-Bent, twisted, broken due to sliding of rocks agaisnt and past themselves.
| Mylonites
- found along fault zones and at the surfaces of faults where blocks have
slid agaisnt each other. |
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| Migmatitic
- showing signs of flow as a liquid or very soft "plastic". Ranges into
igneous flow textures. |
Copyright William C. Wilson 1997
Send email to wcw@dragonlogic.com
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