Harzburgite

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What Wikipedia says

Harzburgite, an ultramafic, igneous rock, is a variety of peridotite consisting mostly of the two minerals olivine and low-calcium (Ca) pyroxene (enstatite); it is named for occurrences in the Harz Mountains of Germany. It commonly contains a few percent chromium-rich spinel as an accessory mineral.

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

Image: Diorit, CC0, via Wikimedia Commons.