%diaspore%

n. [ From Gr. &unr_; a scattering; dia` through, asunder + &unr_; to sow, scatter like seed: cf. F. diaspore. ] (Min.) A hydrate of alumina, often occurring in white lamellar masses with brilliant pearly luster; -- so named on account of its decrepitating when heated before the blowpipe. [ 1913 Webster ]