Common metamorphic rocks
Foliated rocks
•Schist
•Medium- to coarse-grained
•Platy minerals (mainly micas) predominate
•The term schist describes the texture
•To indicate composition, mineral names are
used (such as mica schist)
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Metamorphic Rocks - Dynamic Earth - Lecture Slides, Slides of Earth Sciences
Common Metamorphic Rocks, Foliated Rocks, Schist, Gneiss, Deformed and Folded Gneiss, Classifying Metamorphic Rocks, Nonfoliated Rocks, Marble, Quartzite, Quartz Grains are important points of this lecture of dynamic earth course.
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Common metamorphic rocks
Foliated rocks
- Schist
- Medium- to coarse-grained
- Platy minerals (mainly micas) predominate
- The term schist describes the texture
- To indicate composition, mineral names are used (such as mica schist)
Figure 8.15 (^) Mica schist – composed mostly of muscovite &
biotite
Figure 8.11B
Common metamorphic rocks
Foliated rocks
- Gneiss
- Medium- to coarse-grained
- Banded appearance
- High-grade metamorphism
- Often composed of white or light-colored feldspar-rich layers with bands of dark ferromagnesian minerals
Classifying metamorphic rocks
Figure 8.12 Docsity.com
Common metamorphic rocks
Nonfoliated rocks
- Marble
- Coarse, crystalline
- Parent rock was limestone or dolostone
- Composed essentially of calcite or dolomite crystals
- Used as a decorative and monument stone
- Exhibits a variety of colors
Common metamorphic rocks
Nonfoliated rocks
- Quartzite
- Formed from a parent rock of quartz-rich sandstone
- Quartz grains are fused together
Quartzite
Figure 8.
Figure 8.17B