| Rhombs of ferroan dolomite occur both in the fringe around the fossils and within the matrix of the concretion. |
| The first two vertex stars are made by using five of the thick rhombs, with the black vertices on the inside in the first set and on the outside in the second. |
| By accidentally combining two rhombs in different positions, Huygens discovered the polarisation of light. |
| In places pyrite framboids and polyhedra occur associated with the ferroan dolomite rhombs, the latter aligned as they would have been within the original calcite. |
| Tiny adularia rhombs are also present on the matrix of a specimen showing an unusual association of wire gold with scheelite. |
| The indistinct boundaries between these dolomite rhombs and the calcite suggests that the latter has been partially dolomitized. |
