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https://geology.com/rocks/quartzite.shtml
Quartzite: Metamorphic Rock - Pictures, Definition & More
Quartzite is a nonfoliated metamorphic rock composed almost entirely of quartz. It usually forms from the metamorphism of sandstone.
metamorphic rock picturesquartzitedefinition
https://geology.com/rocks/marble.shtml
Marble: Metamorphic Rock: Pictures, Definition, Properties
Marble is a non-foliated metamorphic rock that forms through the metamorphism of limestone. It has a greater number of potential uses than almost any other...
metamorphic rock picturesdefinition propertiesmarble
https://geology.com/rocks/gneiss.shtml
Gneiss: Metamorphic Rock - Pictures, Definition & More
Gneiss is a foliated metamorphic rock in which the coarse mineral grains have been arranged into bands or layers of varying mineral composition.
metamorphic rock picturesgneissdefinition