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Examples of Nonfoliated Metamorphic Rocks

Metamorphic rocks that do not have distinct layering are called nonfoliated rocks. Below are some common examples of non-foliated metamorphic rocks.

Rock

Picture

(click for larger image)

Features Metamorphic Grade Other information
Marble

(Courtesy USGS)

Since the dominant mineral is usually calcite, this rock fizzes in acid. Marble often has little wavy cracks in it called stylolites. Intermediate to high grade

Marble is metamorphosed limestone!

It is carved into statues and used for building stone.

Quartzite

(Courtesy USGS)

Made of quartz, this rock is able to scratch glass. Intermediate to high grade

Quartzite is metamorphosed sandstone!

It is very hard and is often used as a building stone.

Metabasalt

(Greenstone)

(Courtesy USGS)

This rock is usually non-foliated and sometimes you might find foliated pieces of it. The mineral chlorite gives it a green color. Low grade

Metabasalt is metamorphosed basalt!

It is sometimes called greenstone, or greenschist if it is foliated.

Last modified August 18, 2003 by Lisa Gardiner.

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TES XXVI, 3 fall 2010 The Fall 2010 issue of The Earth Scientist, focuses on rocks and minerals, including articles on minerals and mining, the use of minerals in society, and rare earth minerals, and includes 3 posters!

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