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Searching for that eclogite metamorphic rock, and listening to Coltrane as you turn the bend.

If the plume is rich in a mineral called eclogite, which is denser than typical mantle materials, it will stall as it reaches a depth of about 400 kilometres.

Cyanite is a characteristic mineral of the metamorphic crystalline rocks—gneiss, schist, granulite and eclogite—and is often associated with garnet and staurolite.

Eclogite, ek′loj-īt, n. a crystalline rock, composed of smaragdite and red garnet.

With omphacite and smaragdite, garnet forms the peculiar rock called eclogite.