Troctolite

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What Wikipedia says

Troctolite (from Greek τρώκτης 'trout' and λίθος 'stone') is a mafic intrusive rock type. It consists essentially of major but variable amounts of olivine and calcic plagioclase along with minor pyroxene. It is an olivine-rich anorthosite, or a pyroxene-depleted relative of gabbro.

Excerpt from the Wikipedia article “Troctolite”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA/Johnson Space Center photograph S73-19456., Public domain, via Wikimedia Commons.