Metamorphic Rocks are divided into two basic divisions, summarized in the table below:
1. Foliated/Banded
2. Non-Foliated (also, granular or equidimensional).
FOLIATED
NON-FOLIATED
Complex composition, many different kinds of minerals.
Simple composition, only a few minerals such as calcite or quartz.
Many new minerals produced with a change in T and/or P.
No new minerals form with a change in T and/or P.
external image foliated.gif
Texture is layered, foliated, lineated, banded. Minerals have a preferred orientation.
external image granular.gif
Texture is granular and equi- dimensional. No preferred orientation.
Many rocks with diverse compositions. See Barrovian metamorphism.
Few rocks with simple compositions.
Qtz SS - Quartzite
Limestone - Marble
Dolostone - Dolomitic Marble
Shale - Hornfels
Metamorphic Key
Another Metamorphic Key
Metamorphic Rocks are divided into two basic divisions, summarized
1. Foliated/Banded
2. Non-Foliated (also, granular or equidimensional).
Qtz SS - Quartzite
Limestone - Marble
Dolostone - Dolomitic Marble
Shale - Hornfels