Haematite at Limeslade Bay.

More pictures from Tom of Limeslade bay - this time focussing on the lovely patterns when it is combined with calcite. There's a fault that runs through the limestone in bay and iron minerals have percolated into the spaces between calcite crystals in the fault. In some cases the iron minerals (haematite) have completely replaced the calcite. Apparently the Romans mined the iron deposits and mining actually continued until the late 1800s.