Breccia cemented in part by magnesioriebeckite and in part by dolomite. This is a polymict breccia with clasts of lean franklinite-calcite ore, calcite barren of other minerals, and several large fragments and even terminated crystal fragments of willemite. Additional secondary hydrothermal willemite is intergrown with dolomite in the breccia cement. A very fine geological specimen, with high research potential.