  Consider representation theory associated to symmetric groups, or to Hecke
algebras in type A, or to q-Schur algebras, or to finite general linear groups
in non-describing characteristic. Rock blocks are certain combinatorially
defined blocks appearing in such a representation theory, first observed by R.
Rouquier. Rock blocks are much more symmetric than general blocks, and every
block is derived equivalent to a Rock block. Motivated by a theorem of J.
Chuang and R. Kessar in the case of symmetric group blocks of abelian defect,
we pursue a structure theorem for these blocks.
