EARTH SCIENCE
Atlas of Metamorphic Rocks

Augen Gneiss

Metamorphic Rocks

Metamorphic rocks are rocks which have undergone a change in form, shape, or composition. Changes in temperature, pressure and/or chemistry can alter prexisting rocks into metamorphic rocks. The links below are an attempt to show the common types of folicated and non-foliated metamorphic rocks and some of the varieties that are found. It is by no means a complete list of the types and varieties that are found in the world.

Atlas of Metamorphic Rocks
Rock Name / Image Texture Composition Images
Amphibolite (Hornblende schist) Foliated - Shistose Hornblende, epidote, quartz and plagioclase Close-up1
Eclogite Non-Foliated Garnet and pyroxene, actinolitic hornblende, chlorite, muscovite and pyrite Close-up1
Gneiss (Augen gneiss) Foliated - Gneissic Banding Plagioclase, orthoclase, quartz, biotite, hornblende and magnetite Close-up1
Gneiss (Granitoid gneiss) Foliated - Gneissic Banding Microcline, plagioclase, quartz, garnet, biotite and epidote Close-up1
Gneiss (Sillimanite-garnet gneiss) Foliated - Gneissic Banding Garnet porphyroblasts, quartz, microcline, plagioclase and sillimanite Close-up1
Hornfels (Cordierite hornfels) Non-Foliated Biotite, muscovite, quartz, cordierite Close-up1
Marble Non-Foliated Calcite, with minor mica bands Close-up1
Marble (Dolomite marble) Non-Foliated Dolomite Close-up1
Phyllite Foliated - Phyllitic Quartz, sericite, chlorite, graphite and magnetite Close-up1
Quartzite Non-Foliated Quartz Close-up1
Quartzite (Kyanite quartzite) Non-Foliated Quartz and kyanite Close-up1
Quartzite (Staurolite quartzite) Non-Foliated Quartz, staurolite and magnetite Close-up1
Schist (Actinolite schist) Foliated - Shistose Actinolite, chlorite and talc Close-up1
Schist (Chlorite schist) Foliated - Shistose Chlorite Close-up1
Schist (Cummingtonite schist) Foliated - Shistose Cummingtonite, pyrrhotite, biotite, quartz and garnet Close-up1
Schist (Glaucophane schist) Foliated - Shistose Glaucophane, hornblende and garnet Close-up1
Schist (Graphite schist) Foliated - Shistose Quartz, plagioclase, orthoclase, graphite, muscovite and pyrite Close-up1
Schist (Mica schist) Foliated - Shistose Muscovite, biotite, quartz, feldspar and garnet Close-up1
Schist (Stilpnomelane schist) Foliated - Shistose Stilpnomelane, quartz and pyrite Close-up1
Schist (Talc-tremolite schist) Foliated - Shistose Tremolite and talc Close-up1
Serpentinite (Verd antique) Non-Foliated Serpentine, magnesite, antigorite and talc Close-up1
Skarn (Cordierite anthophyllite skarn) Non-Foliated Cordierite, anthophyllite, muscovite, magnetite, chlorite, apatite and rutile Close-up1
Skarn (Garnet-wollastonite skarn) Non-Foliated Wollastonite, garnet, and diopside Close-up1
Slate Foliated - Slaty Cleavage Sericite, chlorite, carbonate, and quartz Close-up1
Slate (Andalusite slate) Foliated - Slaty Cleavage Andalusite porphyroblasts, graphite, biotite, quartz, fledspar and muscovite Close-up1