A type of volcanic rock with distinctive chemistry, typically containing sodium-rich feldspar and sometimes resembling pumice.
Named after Comenda in the Rift Valley of Kenya where it was first identified, using the geological '-ite' suffix for rock types. The term dates to early 20th-century geological classification.
Geologists name rocks after the places where they're discovered, which is why this African rock carries an African name—it's like a geological passport stamp showing where a rock's identity was first recognized.
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