Day #34 Deskcrop: Mantle Xenolith in Scoria

Today’s deskcrop has as deep an origin as any I’ve yet featured. This is a mantle xenolith (peridotite) in scoria (a type of vesicular basalt). This particular sample comes from Dish Hill in the Mojave Desert. It’s one I collected with Jean Morrison and Lawford Anderson on a prospective graduate student visit to USC during my senior year at Colgate University. That was a really memorable trip, and I’ve gotten a lot of teaching mileage out of this sample over the years.

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Mantle Xenolith (green, at left) in Scoria (black, at right)

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