1
: a usually black or dark green mineral that consists of aluminous pyroxene and is found especially in igneous rocks
2
: pyroxene
Examples of augite in a Sentence
Recent Examples on the Web
The desert sand at the test site is composed mostly of grains of quartz and feldspar, with small crystals of calcite, hornblende, and augite mixed in.
—
David Bressan, Forbes.com, 16 July 2025
Basalt is a volcanic rock composed of augite and sometimes plagioclase and magnetite, which says nothing.
—Louise Erdrich, The New Yorker, 2 Sep. 2019
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
David Bressan, Forbes.com, 16 July 2025
Basalt is a volcanic rock composed of augite and sometimes plagioclase and magnetite, which says nothing.
—Louise Erdrich, The New Yorker, 2 Sep. 2019
Cite this Entry
“Augite.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/augite. Accessed 29 Jul. 2025.
Copy CitationKids Definition
augite
noun
au·gite
ˈȯ-ˌjīt 
: a black to dark green variety of pyroxene
Love words? Need even more definitions?
Merriam-Webster unabridged
Share