Tephrite

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What Wikipedia says

Tephrite is an igneous, volcanic (extrusive) rock, with aphanitic to porphyritic texture. Mineral content is usually abundant feldspathoids (leucite or nepheline), plagioclase, and lesser alkali feldspar. Pyroxenes (clinopyroxenes) are common accessory minerals. Quartz and olivine are absent.

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

Image: Roll-Stone, CC BY-SA 3.0 de, via Wikimedia Commons.