Common Metamorphic Rocks

Metamorphic textures
Foliated texture
Minerals are in a parallel alignment
Minerals are perpendicular to the compressional force
Nonfoliated texture
Contain equidimensional crystals
Resembles a coarse-grained igneous rock

Common metamorphic rocks
Foliated rocks
Slate
Fine-grained
Splits easily
 Schist
Strongly foliated
“Platy”
Types based on composition (e.g., mica schist)

Common metamorphic rocks
Foliated rocks
Gneiss
Strong segregation of silicate minerals
“Banded” texture
Nonfoliated rocks
Marble
Parent rock is limestone
Large, interlocking calcite crystals

Common metamorphic rocks
Nonfoliated rocks
Marble
Used as a building stone
Variety of colors
Quartzite
Parent rock – quartz sandstone
Quartz grains are fused