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Previously published observations of 60 externally-polluted white dwarfs showthat none of the stars have accreted from intact refractory-dominated parentbodies composed mainly of Al, Ca and O, although planetesimals with such adistinctive composition have been predicted to form. We propose that suchremarkable objects are not detected, by themselves, because, unless they arescattered outward from their initial orbit, they are engulfed and destroyedduring the star's Asymptotic Giant Branch evolution. As-yet, there is at mostonly weak evidence supporting a scenario where the composition of anyextrasolar minor planet can be explained by blending of an outwardly scatteredrefractory-dominated planetesimal with an ambient asteroid.

Extrasolar Refractory-Dominated Planetesimals: an Assessment