Keratophyre

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What Wikipedia says

Keratophyre is a volcanic rock of intermediate composition. Although similar to trachyte, keratophyre's plagioclase component is richer in sodium than the plagioclase found in trachyte. Keratophyre forms lava flows and subvolcanic intrusions (dykes and sills).

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

Image: Diorit, CC0, via Wikimedia Commons.